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[lbpng16] Attempt to fix a UMR in png_set_text_2() to fix OSS-fuzz issue.

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This commit is contained in:
Glenn Randers-Pehrson
2017-08-05 20:51:23 -05:00
parent c5c778bcfc
commit 39d84f4f6a
3 changed files with 24 additions and 15 deletions
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35
pngrutil.c
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@@ -2636,23 +2636,28 @@ png_handle_zTXt(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length)
{
png_text text;
/* It worked; png_ptr->read_buffer now looks like a tEXt chunk except
* for the extra compression type byte and the fact that it isn't
* necessarily '\0' terminated.
*/
buffer = png_ptr->read_buffer;
buffer[uncompressed_length+(keyword_length+2)] = 0;
if (png_ptr->read_buffer == NULL)
errmsg="Read failure in png_handle_zTXt";
else
{
/* It worked; png_ptr->read_buffer now looks like a tEXt chunk
* except for the extra compression type byte and the fact that
* it isn't necessarily '\0' terminated.
*/
buffer = png_ptr->read_buffer;
buffer[uncompressed_length+(keyword_length+2)] = 0;
text.compression = PNG_TEXT_COMPRESSION_zTXt;
text.key = (png_charp)buffer;
text.text = (png_charp)(buffer + keyword_length+2);
text.text_length = uncompressed_length;
text.itxt_length = 0;
text.lang = NULL;
text.lang_key = NULL;
text.compression = PNG_TEXT_COMPRESSION_zTXt;
text.key = (png_charp)buffer;
text.text = (png_charp)(buffer + keyword_length+2);
text.text_length = uncompressed_length;
text.itxt_length = 0;
text.lang = NULL;
text.lang_key = NULL;
if (png_set_text_2(png_ptr, info_ptr, &text, 1) != 0)
errmsg = "insufficient memory";
if (png_set_text_2(png_ptr, info_ptr, &text, 1) != 0)
errmsg = "insufficient memory";
}
}
else