On Sun, Apr 21, 2019 at 11:36:00AM +0200, Paul B Mahol wrote: > On 4/21/19, Michael Niedermayer <mich...@niedermayer.cc> wrote: > > Fixes: SEGV on unknown address > > Fixes: > > 14198/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_AGM_fuzzer-5723579234123776 > > > > untested due to lack of valid samples using this codepath > > > > Found-by: continuous fuzzing process > > https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg > > Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc> > > --- > > libavcodec/agm.c | 10 ++++++++-- > > 1 file changed, 8 insertions(+), 2 deletions(-) > > > > diff --git a/libavcodec/agm.c b/libavcodec/agm.c > > index f3d81bf163..c9d7be5521 100644 > > --- a/libavcodec/agm.c > > +++ b/libavcodec/agm.c > > @@ -919,7 +919,7 @@ static void get_tree_codes(uint32_t *codes, Node *nodes, > > int idx, uint32_t pfx, > > } > > } > > > > -static void make_new_tree(const uint8_t *bitlens, uint32_t *codes) > > +static int make_new_tree(const uint8_t *bitlens, uint32_t *codes) > > { > > int zlcount = 0, curlen, idx, nindex, last, llast; > > int blcounts[32] = { 0 }; > > @@ -959,6 +959,9 @@ static void make_new_tree(const uint8_t *bitlens, > > uint32_t *codes) > > int p = node_idx[nindex - 1 + 512]; > > int ch = syms[256 * curlen + i]; > > > > + if (nindex <= 0) > > + return AVERROR_INVALIDDATA; > > + > > if (nodes[p].child[0] == -1) { > > nodes[p].child[0] = ch; > > } else { > > @@ -998,6 +1001,7 @@ static void make_new_tree(const uint8_t *bitlens, > > uint32_t *codes) > > next: > > > > get_tree_codes(codes, nodes, 256, 0, 0); > > + return 0; > > } > > > > static int build_huff(const uint8_t *bitlen, VLC *vlc) > > @@ -1008,7 +1012,9 @@ static int build_huff(const uint8_t *bitlen, VLC *vlc) > > uint32_t codes[256]; > > int nb_codes = 0; > > > > - make_new_tree(bitlen, new_codes); > > + int ret = make_new_tree(bitlen, new_codes); > > + if (ret < 0) > > + return ret; > > > > for (int i = 0; i < 256; i++) { > > if (bitlen[i]) { > > -- > > 2.21.0 > > > > _______________________________________________ > > ffmpeg-devel mailing list > > ffmpeg-devel@ffmpeg.org > > https://ffmpeg.org/mailman/listinfo/ffmpeg-devel > > > > To unsubscribe, visit link above, or email > > ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe". > > LGTM
will apply thx [...] -- Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB Breaking DRM is a little like attempting to break through a door even though the window is wide open and the only thing in the house is a bunch of things you dont want and which you would get tomorrow for free anyway
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