diff options
| author | Lasse Collin <lasse.collin@tukaani.org> | 2011-01-12 17:01:25 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-01-13 08:03:25 -0800 |
| commit | 1da914e0648ace34e1c3738d9584e8b2cd6fe64a (patch) | |
| tree | d52798bed2086ea7fd9182ff1e9ddae8b09c4740 /lib | |
| parent | 303148045aac34b70db722a54e5ad94a3a6625c6 (diff) | |
| download | lwn-1da914e0648ace34e1c3738d9584e8b2cd6fe64a.tar.gz lwn-1da914e0648ace34e1c3738d9584e8b2cd6fe64a.zip | |
decompressors: check input size in decompress_inflate.c
Check for end of the input buffer when skipping over the filename field in
the .gz file header.
Signed-off-by: Lasse Collin <lasse.collin@tukaani.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Alain Knaff <alain@knaff.lu>
Cc: Albin Tonnerre <albin.tonnerre@free-electrons.com>
Cc: Phillip Lougher <phillip@lougher.demon.co.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/decompress_inflate.c | 17 |
1 files changed, 13 insertions, 4 deletions
diff --git a/lib/decompress_inflate.c b/lib/decompress_inflate.c index b5fe1d1d5f05..19ff89e34eec 100644 --- a/lib/decompress_inflate.c +++ b/lib/decompress_inflate.c @@ -98,13 +98,22 @@ STATIC int INIT gunzip(unsigned char *buf, int len, * possible asciz filename) */ strm->next_in = zbuf + 10; + strm->avail_in = len - 10; /* skip over asciz filename */ if (zbuf[3] & 0x8) { - while (strm->next_in[0]) - strm->next_in++; - strm->next_in++; + do { + /* + * If the filename doesn't fit into the buffer, + * the file is very probably corrupt. Don't try + * to read more data. + */ + if (strm->avail_in == 0) { + error("header error"); + goto gunzip_5; + } + --strm->avail_in; + } while (*strm->next_in++); } - strm->avail_in = len - (strm->next_in - zbuf); strm->next_out = out_buf; strm->avail_out = out_len; |