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Fix an off-by-one error in png_do_check_palette_indexes

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The last byte of each row was ignored in a function that was executed
under the build flags `PNG_READ_CHECK_FOR_INVALID_INDEX_SUPPORTED` and
`PNG_WRITE_CHECK_FOR_INVALID_INDEX_SUPPORTED`.

This is a revert of a change previously applied in libpng-1.6.33beta01.
See SourceForge bug #269 at https://sourceforge.net/p/libpng/bugs/269/

Reviewed-by: John Bowler <jbowler@acm.org>
Signed-off-by: Cosmin Truta <ctruta@gmail.com>
This commit is contained in:
Adam Richter 2020-08-30 14:06:01 -07:00 committed by Cosmin Truta
parent 6f8257e437
commit 866fdf6f8f
2 changed files with 2 additions and 1 deletions
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1
AUTHORS
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@ -4,6 +4,7 @@ PNG REFERENCE LIBRARY AUTHORS
This is the list of PNG Reference Library ("libpng") Contributing
Authors, for copyright and licensing purposes.
* Adam Richter
* Andreas Dilger
* Cosmin Truta
* Dave Martindale

2
pngtrans.c
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@ -708,7 +708,7 @@ png_do_check_palette_indexes(png_structrp png_ptr, png_row_infop row_info)
* forms produced on either GCC or MSVC.
*/
int padding = PNG_PADBITS(row_info->pixel_depth, row_info->width);
png_bytep rp = png_ptr->row_buf + row_info->rowbytes - 1;
png_bytep rp = png_ptr->row_buf + row_info->rowbytes;
switch (row_info->bit_depth)
{