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| author | Diego Biurrun <diego@biurrun.de> | 2017-08-11 19:15:20 +0200 |
|---|---|---|
| committer | Diego Biurrun <diego@biurrun.de> | 2017-08-13 19:58:40 +0200 |
| commit | d34a133b78afe2793cd8537f3c7f42437f441e94 (patch) | |
| tree | be1615d884c39b0a1cd4e7a11ef1e43f620e0249 /libavcodec/dfa.c | |
| parent | a14a12ca137bf1526452b97bedfc9f7b301d4e04 (diff) | |
| download | ffmpeg-d34a133b78afe2793cd8537f3c7f42437f441e94.tar.gz | |
dfa: Disallow odd width/height and add proper bounds check for DDS1 chunks
DDS1 chunks are decoded in 2x2 blocks, odd chunk width or height is not
allowed in that case. Also ensure that the decode buffer is big enough
for all blocks being processed.
Bug-Id: CVE-2017-9992
CC: libav-stable@libav.org
Diffstat (limited to 'libavcodec/dfa.c')
| -rw-r--r-- | libavcodec/dfa.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/libavcodec/dfa.c b/libavcodec/dfa.c index 2654118fad..1682eb08cd 100644 --- a/libavcodec/dfa.c +++ b/libavcodec/dfa.c @@ -144,6 +144,8 @@ static int decode_dds1(GetByteContext *gb, uint8_t *frame, int width, int height int mask = 0x10000, bitbuf = 0; int i, v, offset, count, segments; + if ((width | height) & 1) + return AVERROR_INVALIDDATA; segments = bytestream2_get_le16(gb); while (segments--) { if (bytestream2_get_bytes_left(gb) < 2) @@ -171,7 +173,7 @@ static int decode_dds1(GetByteContext *gb, uint8_t *frame, int width, int height return AVERROR_INVALIDDATA; frame += v; } else { - if (frame_end - frame < width + 3) + if (width < 4 || frame_end - frame < width + 4) return AVERROR_INVALIDDATA; frame[0] = frame[1] = frame[width] = frame[width + 1] = bytestream2_get_byte(gb); |