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avformat/fitsdec: Better size checks 

Fixes: out of array access
Fixes: 26819/clusterfuzz-testcase-minimized-ffmpeg_dem_FITS_fuzzer-5634559355650048
Fixes: 26820/clusterfuzz-testcase-minimized-ffmpeg_dem_FITS_fuzzer-5760774955597824
Fixes: 27379/clusterfuzz-testcase-minimized-ffmpeg_dem_FITS_fuzzer-5129775942991872.fuzz

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 14bbb6bb30)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2020-11-03 23:41:36 +01:00
parent 39006dfef8
commit 6102e7ca96
1 changed files with 8 additions and 2 deletions
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10
libavformat/fitsdec.c
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@ -24,6 +24,7 @@
* FITS demuxer.
*/
#include "libavutil/avassert.h"
#include "libavutil/intreadwrite.h"
#include "internal.h"
#include "libavutil/opt.h"
@ -125,14 +126,14 @@ static int64_t is_image(AVFormatContext *s, FITSContext *fits, FITSHeader *heade
size += header->pcount;
t = (abs(header->bitpix) >> 3) * ((int64_t) header->gcount);
if(size && t > UINT64_MAX / size)
if(size && t > INT64_MAX / size)
return AVERROR_INVALIDDATA;
size *= t;
if (!size) {
image = 0;
} else {
if(FITS_BLOCK_SIZE - 1 > UINT64_MAX - size)
if(FITS_BLOCK_SIZE - 1 > INT64_MAX - size)
return AVERROR_INVALIDDATA;
size = ((size + FITS_BLOCK_SIZE - 1) / FITS_BLOCK_SIZE) * FITS_BLOCK_SIZE;
}
@ -173,6 +174,11 @@ static int fits_read_packet(AVFormatContext *s, AVPacket *pkt)
goto fail;
}
av_assert0(avbuf.len <= INT64_MAX && size <= INT64_MAX);
if (avbuf.len + size > INT_MAX - 80) {
ret = AVERROR_INVALIDDATA;
goto fail;
}
// Header is sent with the first line removed...
ret = av_new_packet(pkt, avbuf.len - 80 + size);
if (ret < 0)