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[libpng17] Added #ifndef __COVERITY__ where needed in png.c, pngrutil.c and

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pngset.c to avoid warnings about dead code.
This commit is contained in:
Glenn Randers-Pehrson
2015-01-27 07:00:59 -06:00
parent 5bdcb914a4
commit 565e1bc1ae
5 changed files with 99 additions and 56 deletions
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9
ANNOUNCE
View File

@@ -1,5 +1,5 @@
Libpng 1.7.0beta47 - January 13, 2015
Libpng 1.7.0beta47 - January 27, 2015
This is not intended to be a public release. It will be replaced
within a few weeks by a public version or by another test version.
@@ -688,9 +688,14 @@ Version 1.7.0beta46 [January 2, 2015]
Fixed byte order in 2-byte filler, in png_do_read_filler().
Allow user to call png_get_IHDR() with NULL arguments (Reuben Hawkins).
Version 1.7.0beta47 [January 13, 2015]
Version 1.7.0beta47 [January 27, 2015]
Made the check for out-of-range values in png_set_tRNS() detect
values that are exactly 2^bit_depth, and work on 16-bit platforms.
Added PNG_SKIP_sRGB_CHECK_PROFILE choice for png_set_option().
Report all IHDR errors before exiting png_check_IHDR().
Merged some parts of libpng-1.6.17beta01 and libpng-1.7.0beta47.
Added #ifndef __COVERITY__ where needed in png.c, pngrutil.c and
pngset.c to avoid warnings about dead code.
Send comments/corrections/commendations to png-mng-implement at lists.sf.net
(subscription required; visit

7
CHANGES
View File

@@ -4977,9 +4977,14 @@ Version 1.7.0beta46 [January 2, 2015]
Fixed byte order in 2-byte filler, in png_do_read_filler().
Allow user to call png_get_IHDR() with NULL arguments (Reuben Hawkins).
Version 1.7.0beta47 [January 13, 2015]
Version 1.7.0beta47 [January 27, 2015]
Made the check for out-of-range values in png_set_tRNS() detect
values that are exactly 2^bit_depth, and work on 16-bit platforms.
Added PNG_SKIP_sRGB_CHECK_PROFILE choice for png_set_option().
Report all IHDR errors before exiting png_check_IHDR().
Merged some parts of libpng-1.6.17beta01 and libpng-1.7.0beta47.
Added #ifndef __COVERITY__ where needed in png.c, pngrutil.c and
pngset.c to avoid warnings about dead code.
Send comments/corrections/commendations to png-mng-implement at lists.sf.net
(subscription required; visit

52
png.c
View File

@@ -140,8 +140,10 @@ png_calculate_crc(png_structrp png_ptr, png_const_bytep ptr, png_size_t length)
do
{
uInt safe_length = (uInt)length;
#ifndef __COVERITY__
if (safe_length == 0)
safe_length = (uInt)-1; /* evil, but safe */
#endif
crc = crc32(crc, ptr, safe_length);
@@ -678,7 +680,7 @@ png_convert_to_rfc1123_buffer(char out[29], png_const_timep ptime)
return 1;
}
# endif /* PNG_TIME_RFC1123_SUPPORTED */
# endif /* TIME_RFC1123 */
#endif /* READ || WRITE */
@@ -691,13 +693,13 @@ png_get_copyright(png_const_structrp png_ptr)
#else
# ifdef __STDC__
return PNG_STRING_NEWLINE \
"libpng version 1.7.0beta47 - January 2, 2015" PNG_STRING_NEWLINE \
"libpng version 1.7.0beta47 - January 27, 2015" PNG_STRING_NEWLINE \
"Copyright (c) 1998-2015 Glenn Randers-Pehrson" PNG_STRING_NEWLINE \
"Copyright (c) 1996-1997 Andreas Dilger" PNG_STRING_NEWLINE \
"Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc." \
PNG_STRING_NEWLINE;
# else
return "libpng version 1.7.0beta47 - January 2, 2015\
return "libpng version 1.7.0beta47 - January 27, 2015\
Copyright (c) 1998-2015 Glenn Randers-Pehrson\
Copyright (c) 1996-1997 Andreas Dilger\
Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.";
@@ -1678,7 +1680,8 @@ is_ICC_signature_char(png_alloc_size_t it)
(it >= 97 && it <= 122);
}
static int is_ICC_signature(png_alloc_size_t it)
static int
is_ICC_signature(png_alloc_size_t it)
{
return is_ICC_signature_char(it >> 24) /* checks all the top bits */ &&
is_ICC_signature_char((it >> 16) & 0xff) &&
@@ -1742,7 +1745,7 @@ png_colorspace_set_sRGB(png_const_structrp png_ptr, png_colorspacerp colorspace,
/* sRGB sets known gamma, end points and (from the chunk) intent. */
/* IMPORTANT: these are not necessarily the values found in an ICC profile
* because ICC profiles store values adapted to a D50 environment; it is
* expected that the ICC profile mediaWhitePointTag will be D50, see the
* expected that the ICC profile mediaWhitePointTag will be D50; see the
* checks and code elsewhere to understand this better.
*
* These XYZ values, which are accurate to 5dp, produce rgb to gray
@@ -1979,7 +1982,7 @@ png_icc_check_header(png_const_structrp png_ptr, png_colorspacerp colorspace,
"invalid embedded Abstract ICC profile");
case 0x6C696E6B: /* 'link' */
/* DeviceLink profiles cannnot be interpreted in a non-device specific
/* DeviceLink profiles cannot be interpreted in a non-device specific
* fashion, if an app uses the AToB0Tag in the profile the results are
* undefined unless the result is sent to the intended device,
* therefore a DeviceLink profile should not be found embedded in a
@@ -1990,7 +1993,7 @@ png_icc_check_header(png_const_structrp png_ptr, png_colorspacerp colorspace,
case 0x6E6D636C: /* 'nmcl' */
/* A NamedColor profile is also device specific, however it doesn't
* contain an AToB0 tag that is open to misintrepretation. Almost
* contain an AToB0 tag that is open to misinterpretation. Almost
* certainly it will fail the tests below.
*/
(void)png_icc_profile_error(png_ptr, NULL, name, temp,
@@ -2071,7 +2074,7 @@ png_icc_check_tag_table(png_const_structrp png_ptr, png_colorspacerp colorspace,
return 1; /* success, maybe with warnings */
}
#ifdef PNG_sRGB_SUPPORTED
#if defined(PNG_sRGB_SUPPORTED) && PNG_sRGB_PROFILE_CHECKS >= 0
/* Information about the known ICC sRGB profiles */
static const struct
{
@@ -2152,6 +2155,13 @@ png_compare_ICC_profile_with_sRGB(png_const_structrp png_ptr,
#endif
unsigned int i;
#ifdef PNG_SET_OPTION_SUPPORTED
/* First see if PNG_SKIP_sRGB_CHECK_PROFILE has been set to "on" */
if (((png_ptr->options >> PNG_SKIP_sRGB_CHECK_PROFILE) & 3) ==
PNG_OPTION_ON)
return 0;
#endif
for (i=0; i < (sizeof png_sRGB_checks) / (sizeof png_sRGB_checks[0]); ++i)
{
if (png_get_uint_32(profile+84) == png_sRGB_checks[i].md5[0] &&
@@ -2229,7 +2239,6 @@ png_compare_ICC_profile_with_sRGB(png_const_structrp png_ptr,
return 1+png_sRGB_checks[i].is_broken;
}
}
}
# if PNG_sRGB_PROFILE_CHECKS > 0
/* The signature matched, but the profile had been changed in some
@@ -2239,9 +2248,11 @@ png_compare_ICC_profile_with_sRGB(png_const_structrp png_ptr,
png_chunk_report(png_ptr,
"Not recognizing known sRGB profile that has been edited",
PNG_CHUNK_WARNING);
break;
# endif
}
}
}
return 0; /* no match */
}
@@ -2382,12 +2393,14 @@ png_check_IHDR(png_const_structrp png_ptr,
png_warning(png_ptr, "Image width is zero in IHDR");
error = 1;
}
else if (width > PNG_UINT_31_MAX)
if (width > PNG_UINT_31_MAX)
{
png_warning(png_ptr, "Invalid image width in IHDR");
error = 1;
}
else if (png_gt(((width + 7) & (~7)),
if (png_gt(((width + 7) & (~7)),
((PNG_SIZE_MAX
- 48 /* big_row_buf hack */
- 1) /* filter byte */
@@ -2408,8 +2421,7 @@ png_check_IHDR(png_const_structrp png_ptr,
png_warning(png_ptr, "Image width is too large for this architecture");
error = 1;
}
else
{
#ifdef PNG_SET_USER_LIMITS_SUPPORTED
if (width > png_ptr->user_width_max)
#else
@@ -2419,20 +2431,19 @@ png_check_IHDR(png_const_structrp png_ptr,
png_warning(png_ptr, "Image width exceeds user limit in IHDR");
error = 1;
}
}
if (height == 0)
{
png_warning(png_ptr, "Image height is zero in IHDR");
error = 1;
}
else if (height > PNG_UINT_31_MAX)
if (height > PNG_UINT_31_MAX)
{
png_warning(png_ptr, "Invalid image height in IHDR");
error = 1;
}
else
{
#ifdef PNG_SET_USER_LIMITS_SUPPORTED
if (height > png_ptr->user_height_max)
#else
@@ -2442,7 +2453,6 @@ png_check_IHDR(png_const_structrp png_ptr,
png_warning(png_ptr, "Image height exceeds user limit in IHDR");
error = 1;
}
}
/* Check other values */
if (bit_depth != 1 && bit_depth != 2 && bit_depth != 4 &&
@@ -2673,7 +2683,7 @@ png_check_fp_string(png_const_charp string, png_size_t size)
return 0; /* i.e. fail */
}
#endif /* pCAL or sCAL */
#endif /* pCAL || sCAL */
#ifdef PNG_sCAL_SUPPORTED
# ifdef PNG_FLOATING_POINT_SUPPORTED
@@ -4302,7 +4312,7 @@ const png_uint_16 png_sRGB_table[256] =
61517,62082,62650,63221,63795,64372,64952,65535
};
#endif /* simplified read only */
#endif /* SIMPLIFIED_READ */
/* The base/delta tables are required for both read and write (but currently
* only the simplified versions.)
@@ -4502,4 +4512,4 @@ png_image_error(png_imagep image, png_const_charp error_message)
}
#endif /* SIMPLIFIED READ/WRITE */
#endif /* REA) || WRITE */
#endif /* READ || WRITE */

6
pngrutil.c
View File

@@ -1499,8 +1499,10 @@ png_handle_iCCP(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length)
else if (size > 0)
errmsg = "truncated";
#ifndef __COVERITY__
else
errmsg = png_ptr->zstream.msg;
#endif
}
/* else png_icc_check_tag_table output an error */
@@ -2829,7 +2831,7 @@ png_handle_unknown(png_structrp png_ptr, png_inforp info_ptr,
else
/* Use the SAVE_UNKNOWN_CHUNKS code or skip the chunk */
# endif /* PNG_READ_USER_CHUNKS_SUPPORTED */
# endif /* READ_USER_CHUNKS */
# ifdef PNG_SAVE_UNKNOWN_CHUNKS_SUPPORTED
{
@@ -2896,7 +2898,7 @@ png_handle_unknown(png_structrp png_ptr, png_inforp info_ptr,
--(png_ptr->user_chunk_cache_max);
/* FALL THROUGH */
case 0: /* no limit */
# endif /* PNG_USER_LIMITS_SUPPORTED */
# endif /* USER_LIMITS */
/* Here when the limit isn't reached or when limits are compiled
* out; store the chunk.
*/

35
pngset.c
View File

@@ -130,7 +130,7 @@ png_set_cHRM_XYZ(png_const_structrp png_ptr, png_inforp info_ptr, double red_X,
png_fixed(png_ptr, blue_Y, "cHRM Red Y"),
png_fixed(png_ptr, blue_Z, "cHRM Red Z"));
}
# endif /* PNG_FLOATING_POINT_SUPPORTED */
# endif /* FLOATING_POINT */
#endif /* cHRM */
@@ -190,6 +190,7 @@ png_set_hIST(png_const_structrp png_ptr, png_inforp info_ptr,
if (info_ptr->hist == NULL)
{
png_warning(png_ptr, "Insufficient memory for hIST chunk data");
return;
}
@@ -301,6 +302,7 @@ png_set_pCAL(png_const_structrp png_ptr, png_inforp info_ptr,
if (info_ptr->pcal_purpose == NULL)
{
png_warning(png_ptr, "Insufficient memory for pCAL purpose");
return;
}
@@ -322,6 +324,7 @@ png_set_pCAL(png_const_structrp png_ptr, png_inforp info_ptr,
if (info_ptr->pcal_units == NULL)
{
png_warning(png_ptr, "Insufficient memory for pCAL units");
return;
}
@@ -333,6 +336,7 @@ png_set_pCAL(png_const_structrp png_ptr, png_inforp info_ptr,
if (info_ptr->pcal_params == NULL)
{
png_warning(png_ptr, "Insufficient memory for pCAL params");
return;
}
@@ -349,6 +353,7 @@ png_set_pCAL(png_const_structrp png_ptr, png_inforp info_ptr,
if (info_ptr->pcal_params[i] == NULL)
{
png_warning(png_ptr, "Insufficient memory for pCAL parameter");
return;
}
@@ -398,6 +403,7 @@ png_set_sCAL_s(png_const_structrp png_ptr, png_inforp info_ptr,
if (info_ptr->scal_s_width == NULL)
{
png_warning(png_ptr, "Memory allocation failed while processing sCAL");
return;
}
@@ -416,6 +422,7 @@ png_set_sCAL_s(png_const_structrp png_ptr, png_inforp info_ptr,
info_ptr->scal_s_width = NULL;
png_warning(png_ptr, "Memory allocation failed while processing sCAL");
return;
}
@@ -520,6 +527,7 @@ png_set_PLTE(png_structrp png_ptr, png_inforp info_ptr,
else
{
png_warning(png_ptr, "Invalid palette length");
return;
}
}
@@ -532,7 +540,6 @@ png_set_PLTE(png_structrp png_ptr, png_inforp info_ptr,
))
{
png_error(png_ptr, "Invalid palette");
return;
}
/* It may not actually be necessary to set png_ptr->palette here;
@@ -656,6 +663,7 @@ png_set_iCCP(png_const_structrp png_ptr, png_inforp info_ptr,
if (new_iccp_name == NULL)
{
png_benign_error(png_ptr, "Insufficient memory to process iCCP chunk");
return;
}
@@ -669,6 +677,7 @@ png_set_iCCP(png_const_structrp png_ptr, png_inforp info_ptr,
new_iccp_name = NULL;
png_benign_error(png_ptr,
"Insufficient memory to process iCCP profile");
return;
}
@@ -833,6 +842,7 @@ png_set_text_2(png_structrp png_ptr, png_inforp info_ptr,
{
png_chunk_report(png_ptr, "text chunk: out of memory",
PNG_CHUNK_WRITE_ERROR);
return 1;
}
@@ -906,6 +916,7 @@ png_set_tIME(png_const_structrp png_ptr, png_inforp info_ptr,
mod_time->second > 60)
{
png_warning(png_ptr, "Ignoring invalid time value");
return;
}
@@ -981,7 +992,7 @@ png_set_tRNS(png_structrp png_ptr, png_inforp info_ptr,
else /* not a PALETTE image */
{
/* Invalidate any prior transparent color, set num_trans too, it is not
/* Invalidate any prior transparent color and set num_trans. It is not
* used internally in this case but png_get_tRNS still returns it.
*/
info_ptr->valid &= ~PNG_INFO_tRNS;
@@ -1171,6 +1182,7 @@ png_set_unknown_chunks(png_structrp png_ptr,
if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0)
{
png_app_error(png_ptr, "no unknown chunk support on read");
return;
}
# endif
@@ -1179,6 +1191,7 @@ png_set_unknown_chunks(png_structrp png_ptr,
if ((png_ptr->mode & PNG_IS_READ_STRUCT) == 0)
{
png_app_error(png_ptr, "no unknown chunk support on write");
return;
}
# endif
@@ -1308,6 +1321,7 @@ add_one_chunk(png_bytep list, unsigned int count, png_const_bytep add, int keep)
if (memcmp(list, add, 4) == 0)
{
list[4] = (png_byte)keep;
return count;
}
}
@@ -1335,6 +1349,7 @@ png_set_keep_unknown_chunks(png_structrp png_ptr, int keep,
if (keep < 0 || keep >= PNG_HANDLE_CHUNK_LAST)
{
png_app_error(png_ptr, "png_set_keep_unknown_chunks: invalid keep");
return;
}
@@ -1384,6 +1399,7 @@ png_set_keep_unknown_chunks(png_structrp png_ptr, int keep,
* which can be switched off.
*/
png_app_error(png_ptr, "png_set_keep_unknown_chunks: no chunk list");
return;
}
@@ -1399,6 +1415,7 @@ png_set_keep_unknown_chunks(png_structrp png_ptr, int keep,
if (num_chunks + old_num_chunks > UINT_MAX/5)
{
png_app_error(png_ptr, "png_set_keep_unknown_chunks: too many chunks");
return;
}
@@ -1536,23 +1553,27 @@ png_set_compression_buffer_size(png_structrp png_ptr, png_size_t size)
{
png_warning(png_ptr,
"Compression buffer size cannot be changed because it is in use");
return;
}
#ifndef __COVERITY__
if (size > ZLIB_IO_MAX)
{
png_warning(png_ptr,
"Compression buffer size limited to system maximum");
size = ZLIB_IO_MAX; /* must fit */
}
#endif
else if (size < 6)
if (size < 6)
{
/* Deflate will potentially go into an infinite loop on a SYNC_FLUSH
* if this is permitted.
*/
png_warning(png_ptr,
"Compression buffer size cannot be reduced below 6");
return;
}
@@ -1583,12 +1604,12 @@ png_set_user_limits (png_structrp png_ptr, png_uint_32 user_width_max,
* rejected by png_set_IHDR(). To accept any PNG datastream
* regardless of dimensions, set both limits to 0x7ffffffL.
*/
if (png_ptr != NULL)
{
if (png_ptr == NULL)
return;
png_ptr->user_width_max = user_width_max;
png_ptr->user_height_max = user_height_max;
}
}
/* This function was added to libpng 1.4.0 */
void PNGAPI