linux-kernel - [PATCH] UBIFS: fix assertion in layout_in

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Message-Id: <1471008390-19227-1-git-send-email-vincent.stehle@intel.com>
Date:	Fri, 12 Aug 2016 15:26:30 +0200
From:	Vincent Stehlé <vincent.stehle@...el.com>
To:	linux-mtd@...ts.infradead.org
Cc:	linux-kernel@...r.kernel.org,
	Vincent Stehlé <vincent.stehle@...el.com>,
	Artem Bityutskiy <artem.bityutskiy@...ux.intel.com>
Subject: [PATCH] UBIFS: fix assertion in layout_in_gaps()

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>
---
 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 b45345d..51157da 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;
-- 
2.8.1