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OJPEGWriteHeaderInfo(): avoid unsigned integer overflow on strile dimensions close to UINT32_MAX. Fixes https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=16683

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This commit is contained in:
Even Rouault 2019-08-23 23:03:15 +02:00
parent 67f7561e70
commit 7db298e3a8
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GPG Key ID: 33EBBFC47B3DD87D
1 changed files with 2 additions and 2 deletions
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libtiff/tif_ojpeg.c
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@ -1254,10 +1254,10 @@ OJPEGWriteHeaderInfo(TIFF* tif)
*m++=sp->subsampling_convert_cbbuf+n*sp->subsampling_convert_clinelen;
for (n=0; n<sp->subsampling_convert_clines; n++)
*m++=sp->subsampling_convert_crbuf+n*sp->subsampling_convert_clinelen;
sp->subsampling_convert_clinelenout=((sp->strile_width+sp->subsampling_hor-1)/sp->subsampling_hor);
sp->subsampling_convert_clinelenout=sp->strile_width/sp->subsampling_hor + ((sp->strile_width % sp->subsampling_hor) != 0 ? 1 : 0);
sp->subsampling_convert_state=0;
sp->bytes_per_line=sp->subsampling_convert_clinelenout*(sp->subsampling_ver*sp->subsampling_hor+2);
sp->lines_per_strile=((sp->strile_length+sp->subsampling_ver-1)/sp->subsampling_ver);
sp->lines_per_strile=sp->strile_length/sp->subsampling_ver + ((sp->strile_length % sp->subsampling_ver) != 0 ? 1 : 0);
sp->subsampling_convert_log=1;
}
}