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| author | Lasse Collin <lasse.collin@tukaani.org> | 2011-05-01 19:38:42 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-05-02 08:46:12 -0700 |
| commit | 646032e3b05b32d3f20cb108a030593d9d792eb5 (patch) | |
| tree | 1ced1d6ba3628d76ae389175b0f2c24711358d84 | |
| parent | 3fd9952df4964fac7d5868ba48eadcc9dae3ba46 (diff) | |
| download | linux-646032e3b05b32d3f20cb108a030593d9d792eb5.tar.bz2 | |
XZ decompressor: Fix decoding of empty LZMA2 streams
The old code considered valid empty LZMA2 streams to be corrupt.
Note that a typical empty .xz file has no LZMA2 data at all,
and thus most .xz files having no uncompressed data are handled
correctly even without this fix.
Signed-off-by: Lasse Collin <lasse.collin@tukaani.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | lib/xz/xz_dec_lzma2.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/lib/xz/xz_dec_lzma2.c b/lib/xz/xz_dec_lzma2.c index ea5fa4fe9d67..a6cdc969ea42 100644 --- a/lib/xz/xz_dec_lzma2.c +++ b/lib/xz/xz_dec_lzma2.c @@ -969,6 +969,9 @@ XZ_EXTERN enum xz_ret xz_dec_lzma2_run(struct xz_dec_lzma2 *s, */ tmp = b->in[b->in_pos++]; + if (tmp == 0x00) + return XZ_STREAM_END; + if (tmp >= 0xE0 || tmp == 0x01) { s->lzma2.need_props = true; s->lzma2.need_dict_reset = false; @@ -1001,9 +1004,6 @@ XZ_EXTERN enum xz_ret xz_dec_lzma2_run(struct xz_dec_lzma2 *s, lzma_reset(s); } } else { - if (tmp == 0x00) - return XZ_STREAM_END; - if (tmp > 0x02) return XZ_DATA_ERROR; |