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decompressors: check input size in decompress_inflate.c

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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>
This commit is contained in:
Lasse Collin 2011-01-12 17:01:25 -08:00 committed by Linus Torvalds
parent 303148045a
commit 1da914e064
1 changed files with 13 additions and 4 deletions
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17
lib/decompress_inflate.c
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@ -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;