linux-kernel - [PATCH 13/91] fs/partitions/ldm.c: fix oops caused by corrupted partition table

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Message-Id: <20120205220950.003970410@pcw.home.local>
Date:	Sun, 05 Feb 2012 23:10:02 +0100
From:	Willy Tarreau <w@....eu>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Timo Warns <warns@...-sense.de>, Eugene Teo <eugeneteo@...nel.sg>,
	Harvey Harrison <harvey.harrison@...il.com>,
	Richard Russon <rich@...tcap.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Greg KH <gregkh@...uxfoundation.org>
Subject: [PATCH 13/91] fs/partitions/ldm.c: fix oops caused by corrupted partition table

2.6.27-longterm review patch.  If anyone has any objections, please let us know.

------------------

commit c340b1d640001c8c9ecff74f68fd90422ae2448a upstream.

The kernel automatically evaluates partition tables of storage devices.
The code for evaluating LDM partitions (in fs/partitions/ldm.c) contains
a bug that causes a kernel oops on certain corrupted LDM partitions.
A kernel subsystem seems to crash, because, after the oops, the kernel no
longer recognizes newly connected storage devices.

The patch validates the value of vblk_size.

[akpm@...ux-foundation.org: coding-style fixes]
Signed-off-by: Timo Warns <warns@...-sense.de>
Cc: Eugene Teo <eugeneteo@...nel.sg>
Cc: Harvey Harrison <harvey.harrison@...il.com>
Cc: Richard Russon <rich@...tcap.org>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
---
 fs/partitions/ldm.c |   16 ++++++++++++----
 1 files changed, 12 insertions(+), 4 deletions(-)

Index: longterm-2.6.27/fs/partitions/ldm.c
===================================================================
--- longterm-2.6.27.orig/fs/partitions/ldm.c	2012-02-05 22:34:34.635914935 +0100
+++ longterm-2.6.27/fs/partitions/ldm.c	2012-02-05 22:34:36.759915873 +0100
@@ -1299,6 +1299,11 @@
 
 	BUG_ON (!data || !frags);
 
+	if (size < 2 * VBLK_SIZE_HEAD) {
+		ldm_error("Value of size is to small.");
+		return false;
+	}
+
 	group = get_unaligned_be32(data + 0x08);
 	rec   = get_unaligned_be16(data + 0x0C);
 	num   = get_unaligned_be16(data + 0x0E);
@@ -1306,6 +1311,10 @@
 		ldm_error ("A VBLK claims to have %d parts.", num);
 		return false;
 	}
+	if (rec >= num) {
+		ldm_error("REC value (%d) exceeds NUM value (%d)", rec, num);
+		return false;
+	}
 
 	list_for_each (item, frags) {
 		f = list_entry (item, struct frag, list);
@@ -1334,10 +1343,9 @@
 
 	f->map |= (1 << rec);
 
-	if (num > 0) {
-		data += VBLK_SIZE_HEAD;
-		size -= VBLK_SIZE_HEAD;
-	}
+	data += VBLK_SIZE_HEAD;
+	size -= VBLK_SIZE_HEAD;
+
 	memcpy (f->data+rec*(size-VBLK_SIZE_HEAD)+VBLK_SIZE_HEAD, data, size);
 
 	return true;


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