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lzma/gzip: fix potential oops when input data is truncated

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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>
This commit is contained in:
Phillip Lougher
2009-09-23 15:57:37 -07:00
committed by Linus Torvalds
parent 3354f73b24
commit 6a8811629e
2 changed files with 17 additions and 1 deletions
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10
lib/decompress_unlzma.c
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@@ -82,6 +82,11 @@ struct rc {
#define RC_MODEL_TOTAL_BITS 11
static int nofill(void *buffer, unsigned int len)
{
return -1;
}
/* Called twice: once at startup and once in rc_normalize() */
static void INIT rc_read(struct rc *rc)
{
@@ -97,7 +102,10 @@ static inline void INIT rc_init(struct rc *rc,
int (*fill)(void*, unsigned int),
char *buffer, int buffer_size)
{
rc->fill = fill;
if (fill)
rc->fill = fill;
else
rc->fill = nofill;
rc->buffer = (uint8_t *)buffer;
rc->buffer_size = buffer_size;
rc->buffer_end = rc->buffer + rc->buffer_size;