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| author | Michael Niedermayer <michael@niedermayer.cc> | 2022-06-09 22:13:59 +0300 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2022-07-12 23:10:54 +0300 |
| commit | a886e9526d678065ff909b27f353f803f3d4801b (patch) | |
| tree | df6ee640fad3fe0f85f2107f486f67bd3de21f42 | |
| parent | 93d44b10e8bdcf94d2945e0a19572a759e433de9 (diff) | |
avcodec/jpeglsdec: fix end check for xfrm
Fixes: out of array access
Fixes: 47871/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_AMV_fuzzer-5646305956855808
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 6a82412bf33108111eb3f63076fd5a51349ae114)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavcodec/jpeglsdec.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/libavcodec/jpeglsdec.c b/libavcodec/jpeglsdec.c index 615c9e5068..59fb304a83 100644 --- a/libavcodec/jpeglsdec.c +++ b/libavcodec/jpeglsdec.c @@ -465,19 +465,19 @@ int ff_jpegls_decode_picture(MJpegDecodeContext *s, int near, for (i = 0; i < s->height; i++) { switch(s->xfrm) { case 1: - for (x = off; x < w; x += 3) { + for (x = off; x + 2 < w; x += 3) { src[x ] += src[x+1] + 128; src[x+2] += src[x+1] + 128; } break; case 2: - for (x = off; x < w; x += 3) { + for (x = off; x + 2 < w; x += 3) { src[x ] += src[x+1] + 128; src[x+2] += ((src[x ] + src[x+1])>>1) + 128; } break; case 3: - for (x = off; x < w; x += 3) { + for (x = off; x + 2 < w; x += 3) { int g = src[x+0] - ((src[x+2]+src[x+1])>>2) + 64; src[x+0] = src[x+2] + g + 128; src[x+2] = src[x+1] + g + 128; @@ -485,7 +485,7 @@ int ff_jpegls_decode_picture(MJpegDecodeContext *s, int near, } break; case 4: - for (x = off; x < w; x += 3) { + for (x = off; x + 2 < w; x += 3) { int r = src[x+0] - (( 359 * (src[x+2]-128) + 490) >> 8); int g = src[x+0] - (( 88 * (src[x+1]-128) - 183 * (src[x+2]-128) + 30) >> 8); int b = src[x+0] + ((454 * (src[x+1]-128) + 574) >> 8); |