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authorPhillip Lougher <phillip@lougher.demon.co.uk>2009-09-23 15:57:37 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-09-24 07:21:05 -0700
commit6a8811629e9aa611aa710162f9e02020bba52c87 (patch)
treed3b8ff16950f5cda94b3259fbfa097aea9cb1e5f /lib/decompress_inflate.c
parent3354f73b24c6d392ed7fd5583cfcc7604c1934ae (diff)
downloadlinux-6a8811629e9aa611aa710162f9e02020bba52c87.tar.bz2
lzma/gzip: fix potential oops when input data is truncated
If the lzma/gzip decompressors are called with insufficient input data (len > 0 & fill = NULL), they will attempt to call the fill function to obtain more data, leading to a kernel oops. Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk> Cc: "H. Peter Anvin" <hpa@zytor.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'lib/decompress_inflate.c')
-rw-r--r--lib/decompress_inflate.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/lib/decompress_inflate.c b/lib/decompress_inflate.c
index 68dfce59c1b8..fc686c7a0a0d 100644
--- a/lib/decompress_inflate.c
+++ b/lib/decompress_inflate.c
@@ -27,6 +27,11 @@
#define GZIP_IOBUF_SIZE (16*1024)
+static int nofill(void *buffer, unsigned int len)
+{
+ return -1;
+}
+
/* Included from initramfs et al code */
STATIC int INIT gunzip(unsigned char *buf, int len,
int(*fill)(void*, unsigned int),
@@ -76,6 +81,9 @@ STATIC int INIT gunzip(unsigned char *buf, int len,
goto gunzip_nomem4;
}
+ if (!fill)
+ fill = nofill;
+
if (len == 0)
len = fill(zbuf, GZIP_IOBUF_SIZE);