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[libpng17] Avoid dereferencing NULL pointer possibly returned from

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png_create_write_struct() (Andrew Church).
This commit is contained in:
Glenn Randers-Pehrson 2013-04-29 08:58:15 -05:00
parent cf76fe8654
commit 7073d26e51
3 changed files with 37 additions and 33 deletions
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2
ANNOUNCE
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@ -272,6 +272,8 @@ Version 1.7.0beta12 [April 29, 2013]
Added png_app_warning for out-of-range unknown chunk index in
png_set_unknown_chunk_location().
Expanded manual paragraph about writing private chunks.
Avoid dereferencing NULL pointer possibly returned from
png_create_write_struct() (Andrew Church).
Send comments/corrections/commendations to png-mng-implement at lists.sf.net
(subscription required; visit

2
CHANGES
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@ -4560,6 +4560,8 @@ Version 1.7.0beta12 [April 29, 2013]
Added png_app_warning for out-of-range unknown chunk index in
png_set_unknown_chunk_location().
Expanded manual paragraph about writing private chunks.
Avoid dereferencing NULL pointer possibly returned from
png_create_write_struct() (Andrew Church).
Send comments/corrections/commendations to png-mng-implement at lists.sf.net
(subscription required; visit

16
pngwrite.c
View File

@ -500,14 +500,16 @@ png_create_write_struct_2,(png_const_charp user_png_ver, png_voidp error_ptr,
error_fn, warn_fn, mem_ptr, malloc_fn, free_fn);
#endif /* PNG_USER_MEM_SUPPORTED */
if (png_ptr != NULL)
{
/* Set the zlib control values to defaults; they can be overridden by the
* application after the struct has been created.
*/
png_ptr->zbuffer_size = PNG_ZBUF_SIZE;
/* The 'zlib_strategy' setting is irrelevant because png_default_claim in
* pngwutil.c defaults it according to whether or not filters will be used,
* and ignores this setting.
* pngwutil.c defaults it according to whether or not filters will be
* used, and ignores this setting.
*/
png_ptr->zlib_strategy = PNG_Z_DEFAULT_STRATEGY;
png_ptr->zlib_level = PNG_Z_DEFAULT_COMPRESSION;
@ -523,10 +525,10 @@ png_create_write_struct_2,(png_const_charp user_png_ver, png_voidp error_ptr,
png_ptr->zlib_text_method = 8;
#endif /* PNG_WRITE_COMPRESSED_TEXT_SUPPORTED */
/* This is a highly dubious configuration option; by default it is off, but
* it may be appropriate for private builds that are testing extensions not
* conformant to the current specification, or of applications that must not
* fail to write at all costs!
/* This is a highly dubious configuration option; by default it is off,
* but it may be appropriate for private builds that are testing
* extensions not conformant to the current specification, or of
* applications that must not fail to write at all costs!
*/
#ifdef PNG_BENIGN_WRITE_ERRORS_SUPPORTED
png_ptr->flags |= PNG_FLAG_BENIGN_ERRORS_WARN;
@ -542,8 +544,6 @@ png_create_write_struct_2,(png_const_charp user_png_ver, png_voidp error_ptr,
png_ptr->flags |= PNG_FLAG_APP_WARNINGS_WARN;
#endif
if (png_ptr != NULL)
{
/* TODO: delay this, it can be done in png_init_io() (if the app doesn't
* do it itself) avoiding setting the default function if it is not
* required.