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[libpng16] Check for invalid palette index while reading paletted PNG. When

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one is found, issue a warning and increase png_ptr->num_palette accordingly.
Apps are responsible for checking to see if that happened.
This commit is contained in:
Glenn Randers-Pehrson 2012-02-16 20:15:13 -06:00
parent bce7988230
commit 67dba43998
3 changed files with 31 additions and 3 deletions
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7
ANNOUNCE
View File

@ -1,5 +1,5 @@
Libpng 1.6.0beta11 - February 13, 2012
Libpng 1.6.0beta11 - February 17, 2012
This is not intended to be a public release. It will be replaced
within a few weeks by a public version or by another test version.
@ -176,7 +176,7 @@ Version 1.6.0beta10 [February 3, 2012]
Updated the prebuilt configure files to current condition.
Revised INSTALL information about autogen.sh; it works in tar distributions.
Version 1.6.0beta11 [February 13, 2012]
Version 1.6.0beta11 [February 17, 2012]
Fix character count in pngstest command in projects/owatcom/pngstest.tgt
Revised test-pngstest.sh to report PASS/FAIL for each image.
Updated documentation about the simplified API.
@ -207,6 +207,9 @@ Version 1.6.0beta11 [February 13, 2012]
produces warnings from gcc with some warning options (including -Wall). The
fix is to cause png.h to declare the functions with PNG_INTERNAL_FUNCTION
when png.h is included from pngpriv.h.
Check for invalid palette index while reading paletted PNG. When one is
found, issue a warning and increase png_ptr->num_palette accordingly.
Apps are responsible for checking to see if that happened.
Send comments/corrections/commendations to png-mng-implement at lists.sf.net
(subscription required; visit

5
CHANGES
View File

@ -3927,7 +3927,7 @@ Version 1.6.0beta10 [February 3, 2012]
Updated the prebuilt configure files to current condition.
Revised INSTALL information about autogen.sh; it works in tar distributions.
Version 1.6.0beta11 [February 13, 2012]
Version 1.6.0beta11 [February 17, 2012]
Fix character count in pngstest command in projects/owatcom/pngstest.tgt
Revised test-pngstest.sh to report PASS/FAIL for each image.
Updated documentation about the simplified API.
@ -3958,6 +3958,9 @@ Version 1.6.0beta11 [February 13, 2012]
produces warnings from gcc with some warning options (including -Wall). The
fix is to cause png.h to declare the functions with PNG_INTERNAL_FUNCTION
when png.h is included from pngpriv.h.
Check for invalid palette index while reading paletted PNG. When one is
found, issue a warning and increase png_ptr->num_palette accordingly.
Apps are responsible for checking to see if that happened.
Send comments/corrections/commendations to png-mng-implement at lists.sf.net
(subscription required; visit

22
pngread.c
View File

@ -523,6 +523,27 @@ png_read_row(png_structrp png_ptr, png_bytep row, png_bytep dsp_row)
png_error(png_ptr, "bad adaptive filter value");
}
if ((png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) &&
(png_ptr->num_palette < (1 << png_ptr->bit_depth)))
{
if ((png_ptr->interlaced && png_ptr->pass == 6) ||
(!png_ptr->interlaced && png_ptr->pass == 0))
{
png_uint_32 i;
png_bytep rp = png_ptr->row_buf+1;
for (i = 0; i <= row_info.rowbytes; i++)
{
if (*rp >= png_ptr->num_palette)
{
png_warning(png_ptr,"Found invalid palette index");
png_ptr->num_palette=*rp;
}
rp++;
}
}
}
/* libpng 1.5.6: the following line was copying png_ptr->rowbytes before
* 1.5.6, while the buffer really is this big in current versions of libpng
* it may not be in the future, so this was changed just to copy the
@ -585,6 +606,7 @@ png_read_row(png_structrp png_ptr, png_bytep row, png_bytep dsp_row)
if (png_ptr->read_row_fn != NULL)
(*(png_ptr->read_row_fn))(png_ptr, png_ptr->row_number, png_ptr->pass);
}
#endif /* PNG_SEQUENTIAL_READ_SUPPORTED */