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| author | Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com> | 2015-12-13 23:17:09 +0100 |
|---|---|---|
| committer | Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com> | 2015-12-20 14:17:47 +0100 |
| commit | 5b88d24f241f1ae31d86d2987b17a1db7547a509 (patch) | |
| tree | 1d70ae2fc32deb346ee62dd86b4688b50a75dfb5 | |
| parent | 3e187a9a2dfacea0d76df90dd88d957938f9d33c (diff) | |
| download | ffmpeg-5b88d24f241f1ae31d86d2987b17a1db7547a509.tar.gz | |
exr: fix out of bounds read in get_code
This macro unconditionally used out[-1], which causes an out of bounds
read, if out is the very beginning of the buffer.
Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>
(cherry picked from commit 90b99a81071d10e6b5efe86a4602d54d4f45bbcb)
Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>
| -rw-r--r-- | libavcodec/exr.c | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/libavcodec/exr.c b/libavcodec/exr.c index 9308ae03a8..29cb4030c8 100644 --- a/libavcodec/exr.c +++ b/libavcodec/exr.c @@ -459,7 +459,7 @@ static int huf_build_dec_table(const uint64_t *hcode, int im, lc += 8; \ } -#define get_code(po, rlc, c, lc, gb, out, oe) \ +#define get_code(po, rlc, c, lc, gb, out, oe, outb) \ { \ if (po == rlc) { \ if (lc < 8) \ @@ -468,7 +468,7 @@ static int huf_build_dec_table(const uint64_t *hcode, int im, \ cs = c >> lc; \ \ - if (out + cs > oe) \ + if (out + cs > oe || out == outb) \ return AVERROR_INVALIDDATA; \ \ s = out[-1]; \ @@ -501,7 +501,7 @@ static int huf_decode(const uint64_t *hcode, const HufDec *hdecod, if (pl.len) { lc -= pl.len; - get_code(pl.lit, rlc, c, lc, gb, out, oe); + get_code(pl.lit, rlc, c, lc, gb, out, oe, outb); } else { int j; @@ -518,7 +518,7 @@ static int huf_decode(const uint64_t *hcode, const HufDec *hdecod, if ((hcode[pl.p[j]] >> 6) == ((c >> (lc - l)) & ((1LL << l) - 1))) { lc -= l; - get_code(pl.p[j], rlc, c, lc, gb, out, oe); + get_code(pl.p[j], rlc, c, lc, gb, out, oe, outb); break; } } @@ -539,7 +539,7 @@ static int huf_decode(const uint64_t *hcode, const HufDec *hdecod, if (pl.len) { lc -= pl.len; - get_code(pl.lit, rlc, c, lc, gb, out, oe); + get_code(pl.lit, rlc, c, lc, gb, out, oe, outb); } else { return AVERROR_INVALIDDATA; } |