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[libpng12] Use unsigned constants in buffer length comparisons

This commit is contained in:
Glenn Randers-Pehrson 2015-11-21 14:35:23 -06:00
parent 7e1ca9ceba
commit 4488a96126
1 changed files with 6 additions and 5 deletions
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11
pngrutil.c
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@ -1114,7 +1114,7 @@ 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) /* There should be at least one zero (the compression type byte)
* following the separator, and we should be on it * 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_free(png_ptr, png_ptr->chunkdata);
png_ptr->chunkdata = NULL; png_ptr->chunkdata = NULL;
@ -1242,7 +1242,8 @@ png_handle_sPLT(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
++entry_start; ++entry_start;
/* A sample depth should follow the separator, and we should be on it */ /* 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_free(png_ptr, png_ptr->chunkdata);
png_ptr->chunkdata = NULL; png_ptr->chunkdata = NULL;
@ -1716,7 +1717,7 @@ 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 /* We need to have at least 12 bytes after the purpose string
in order to get the parameter information. */ in order to get the parameter information. */
if (slength < 12 || endptr <= buf + 12) if (slength < 12U || endptr - buf <= 12)
{ {
png_warning(png_ptr, "Invalid pCAL data"); png_warning(png_ptr, "Invalid pCAL data");
png_free(png_ptr, png_ptr->chunkdata); png_free(png_ptr, png_ptr->chunkdata);
@ -2172,7 +2173,7 @@ png_handle_zTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
/* Empty loop */ ; /* Empty loop */ ;
/* zTXt must have some text after the chunkdataword */ /* 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_warning(png_ptr, "Truncated zTXt chunk");
png_free(png_ptr, png_ptr->chunkdata); png_free(png_ptr, png_ptr->chunkdata);
@ -2298,7 +2299,7 @@ png_handle_iTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
* keyword * keyword
*/ */
if (slength < 3 || lang >= png_ptr->chunkdata + slength - 3) if (slength < 3U || lang >= png_ptr->chunkdata + slength - 3U)
{ {
png_warning(png_ptr, "Truncated iTXt chunk"); png_warning(png_ptr, "Truncated iTXt chunk");
png_free(png_ptr, png_ptr->chunkdata); png_free(png_ptr, png_ptr->chunkdata);