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[libpng15] Use unsigned constants in buffer length comparisons

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This commit is contained in:
Glenn Randers-Pehrson 2015-11-21 14:33:31 -06:00
parent 68a6e6755b
commit 611e8de78c
1 changed files with 6 additions and 5 deletions
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11
pngrutil.c
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@ -1327,7 +1327,7 @@ png_handle_iCCP(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
/* There should be at least one zero (the compression type byte)
* following the separator, and we should be on it
*/
if (slength < 1 || profile - png_ptr->chunkdata >= slength - 1)
if (slength < 1U || profile >= png_ptr->chunkdata + slength - 1U)
{
png_free(png_ptr, png_ptr->chunkdata);
png_ptr->chunkdata = NULL;
@ -1476,7 +1476,8 @@ png_handle_sPLT(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
++entry_start;
/* A sample depth should follow the separator, and we should be on it */
if (slength < 2 || entry_start - (png_bytep)png_ptr->chunkdata > slength - 2)
if (slength < 2U ||
entry_start > (png_bytep)png_ptr->chunkdata + slength - 2U)
{
png_free(png_ptr, png_ptr->chunkdata);
png_ptr->chunkdata = NULL;
@ -2005,7 +2006,7 @@ png_handle_pCAL(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
/* We need to have at least 12 bytes after the purpose string
* in order to get the parameter information.
*/
if (endptr -buf <= 12)
if (endptr - buf <= 12U)
{
png_warning(png_ptr, "Invalid pCAL data");
png_free(png_ptr, png_ptr->chunkdata);
@ -2417,7 +2418,7 @@ png_handle_zTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
/* Empty loop */ ;
/* zTXt must have some text after the chunkdataword */
if (slength < 2 || text - png_ptr->chunkdata >= slength - 2)
if (slength < 2U || text >= png_ptr->chunkdata + slength - 2U)
{
png_warning(png_ptr, "Truncated zTXt chunk");
png_free(png_ptr, png_ptr->chunkdata);
@ -2554,7 +2555,7 @@ png_handle_iTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
* keyword
*/
if (slength < 3 || png_ptr->chunkdata - lang >= slength - 3)
if (slength < 3U || lang >= png_ptr->chunkdata + slength - 3U)
{
png_warning(png_ptr, "Truncated iTXt chunk");
png_free(png_ptr, png_ptr->chunkdata);