linux-kernel - [RFC/PATCH] mtd: ubi: Test return value of __wl_get

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Date:	Tue,  1 Apr 2014 11:01:12 +0300
From:	Tanya Brokhman <tlinder@...eaurora.org>
To:	dedekind1@...il.com
Cc:	linux-mtd@...ts.infradead.org,
	Tanya Brokhman <tlinder@...eaurora.org>,
	linux-kernel@...r.kernel.org (open list)
Subject: [RFC/PATCH] mtd: ubi: Test return value of __wl_get_peb

In case of an error (if there are not free PEB's for example),
__wl_get_peb will return a negative value. In order to prevent access
violation we need to test the returned value prior to using it later on.

Signed-off-by: Tatyana Brokhman <tlinder@...eaurora.org>

diff --git a/drivers/mtd/ubi/wl.c b/drivers/mtd/ubi/wl.c
index 02317c1..457ead3 100644
--- a/drivers/mtd/ubi/wl.c
+++ b/drivers/mtd/ubi/wl.c
@@ -684,6 +684,9 @@ int ubi_wl_get_peb(struct ubi_device *ubi)
 	peb = __wl_get_peb(ubi);
 	spin_unlock(&ubi->wl_lock);
 
+	if (peb < 0)
+		return peb;
+
 	err = ubi_self_check_all_ff(ubi, peb, ubi->vid_hdr_aloffset,
 				    ubi->peb_size - ubi->vid_hdr_aloffset);
 	if (err) {
-- 
1.7.6
-- 
QUALCOMM ISRAEL, on behalf of Qualcomm Innovation Center, Inc. is a member
of Code Aurora Forum, hosted by The Linux Foundation


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