linux-kernel - [PATCH 3.10 163/319] ubifs: Fix assertion in layout_in

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Message-Id: <1486322541-8206-64-git-send-email-w@1wt.eu>
Date:   Sun,  5 Feb 2017 20:19:45 +0100
From:   Willy Tarreau <w@....eu>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        linux@...ck-us.net
Cc:     Vincent Stehlé <vincent.stehle@...el.com>,
        Artem Bityutskiy <artem.bityutskiy@...ux.intel.com>,
        Richard Weinberger <richard@....at>, Willy Tarreau <w@....eu>
Subject: [PATCH 3.10 163/319] ubifs: Fix assertion in layout_in_gaps()

From: Vincent Stehlé <vincent.stehle@...el.com>

commit c0082e985fdf77b02fc9e0dac3b58504dcf11b7a upstream.

An assertion in layout_in_gaps() verifies that the gap_lebs pointer is
below the maximum bound. When computing this maximum bound the idx_lebs
count is multiplied by sizeof(int), while C pointers arithmetic does take
into account the size of the pointed elements implicitly already. Remove
the multiplication to fix the assertion.

Fixes: 1e51764a3c2ac05a ("UBIFS: add new flash file system")
Signed-off-by: Vincent Stehlé <vincent.stehle@...el.com>
Cc: Artem Bityutskiy <artem.bityutskiy@...ux.intel.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@...ux.intel.com>
Signed-off-by: Richard Weinberger <richard@....at>
Signed-off-by: Willy Tarreau <w@....eu>
---
 fs/ubifs/tnc_commit.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/ubifs/tnc_commit.c b/fs/ubifs/tnc_commit.c
index 52a6559..3f620c0 100644
--- a/fs/ubifs/tnc_commit.c
+++ b/fs/ubifs/tnc_commit.c
@@ -370,7 +370,7 @@ static int layout_in_gaps(struct ubifs_info *c, int cnt)
 
 	p = c->gap_lebs;
 	do {
-		ubifs_assert(p < c->gap_lebs + sizeof(int) * c->lst.idx_lebs);
+		ubifs_assert(p < c->gap_lebs + c->lst.idx_lebs);
 		written = layout_leb_in_gaps(c, p);
 		if (written < 0) {
 			err = written;
-- 
2.8.0.rc2.1.gbe9624a