This is a note to let you know that I've just added the patch titled
decompress_bunzip2: off by one in get_next_block()
to the 3.18-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
decompress_bunzip2-off-by-one-in-get_next_block.patch
and it can be found in the queue-3.18 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From b5c8afe5be51078a979d86ae5ae78c4ac948063d Mon Sep 17 00:00:00 2001
From: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Date: Fri, 12 Dec 2014 16:58:05 -0800
Subject: decompress_bunzip2: off by one in get_next_block()
From: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
commit b5c8afe5be51078a979d86ae5ae78c4ac948063d upstream.
"origPtr" is used as an offset into the bd->dbuf[] array. That array is
allocated in start_bunzip() and has "bd->dbufSize" number of elements so
the test here should be >= instead of >.
Later we check "origPtr" again before using it as an offset so I don't
know if this bug can be triggered in real life.
Fixes: bc22c17e12c1 ('bzip2/lzma: library support for gzip, bzip2 and lzma decompression')
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Cc: Alain Knaff <alain@xxxxxxxx>
Cc: Yinghai Lu <yinghai@xxxxxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
lib/decompress_bunzip2.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/lib/decompress_bunzip2.c
+++ b/lib/decompress_bunzip2.c
@@ -184,7 +184,7 @@ static int INIT get_next_block(struct bu
if (get_bits(bd, 1))
return RETVAL_OBSOLETE_INPUT;
origPtr = get_bits(bd, 24);
- if (origPtr > dbufSize)
+ if (origPtr >= dbufSize)
return RETVAL_DATA_ERROR;
/* mapping table: if some byte values are never used (encoding things
like ascii text), the compression code removes the gaps to have fewer
Patches currently in stable-queue which might be from dan.carpenter@xxxxxxxxxx are
queue-3.18/decompress_bunzip2-off-by-one-in-get_next_block.patch
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