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| author | Michael Niedermayer <michael@niedermayer.cc> | 2019-06-12 20:13:34 +0200 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2019-11-11 20:18:46 +0100 |
| commit | 4c9b4ce11eca702975f154ec13249c7b8c664bfc (patch) | |
| tree | 8aaf1c85327d8d4d6347c1dc13a3f86e45518885 | |
| parent | efa32432ab908914ad06b7d5550a51f0a6710ec5 (diff) | |
| download | ffmpeg-4c9b4ce11eca702975f154ec13249c7b8c664bfc.tar.gz | |
avcodec/xpmdec: Do not use context dimensions as temporary variables
Fixes: Integer overflow
Fixes: 15134/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_XPM_fuzzer-5722635939348480
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 5ea7f2050050fd6a9177a9b618f2bb2d4add9230)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavcodec/xpmdec.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/libavcodec/xpmdec.c b/libavcodec/xpmdec.c index 03172e4aad..82a484dabb 100644 --- a/libavcodec/xpmdec.c +++ b/libavcodec/xpmdec.c @@ -307,6 +307,7 @@ static int xpm_decode_frame(AVCodecContext *avctx, void *data, int ncolors, cpp, ret, i, j; int64_t size; uint32_t *dst; + int width, height; avctx->pix_fmt = AV_PIX_FMT_BGRA; @@ -328,12 +329,12 @@ static int xpm_decode_frame(AVCodecContext *avctx, void *data, ptr += mod_strcspn(ptr, "\""); if (sscanf(ptr, "\"%u %u %u %u\",", - &avctx->width, &avctx->height, &ncolors, &cpp) != 4) { + &width, &height, &ncolors, &cpp) != 4) { av_log(avctx, AV_LOG_ERROR, "missing image parameters\n"); return AVERROR_INVALIDDATA; } - if ((ret = ff_set_dimensions(avctx, avctx->width, avctx->height)) < 0) + if ((ret = ff_set_dimensions(avctx, width, height)) < 0) return ret; if ((ret = ff_get_buffer(avctx, p, 0)) < 0) |