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[libpng16] Removed erroneous setting of DETECT_UNINITIALIZED and added more

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checks. The code now does a png_error if an attempt is made to do the
row initialization twice; this is an application error and it has
serious consequences because the transform data in png_struct is
changed by each call.
This commit is contained in:
John Bowler
2012-03-18 21:10:29 -05:00
committed by Glenn Randers-Pehrson
parent 0c11b5f8e7
commit 66efa24241
5 changed files with 98 additions and 104 deletions
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11
pngrutil.c
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@@ -4105,17 +4105,6 @@ png_read_start_row(png_structrp png_ptr)
png_debug(1, "in png_read_start_row");
/* Because init_read_transformations, below, modifies values in png_struct
* it will not always work correctly if called twice. This error detects
* that condition but just warns, because it does tend to work most of the
* time.
*/
if (png_ptr->flags & PNG_FLAG_ROW_INIT)
{
png_warning(png_ptr, "unexpected duplicate call to png_read_start_row");
png_ptr->zowner = 0; /* release previous claim */
}
#ifdef PNG_READ_TRANSFORMS_SUPPORTED
png_init_read_transformations(png_ptr);
#endif