From: Maxin B. John <john.maxin@nokia.com>
Date: Fri, 20 May 2011 14:44:10 +0000 (+0100)
Subject: mtd: mtdswap: fix possible null dereference
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=8d8f26e19cae48541b824f164021e1ff05067f8c;p=linux-beck.git

mtd: mtdswap: fix possible null dereference

This patch fixes the possible null dereference of the variable "oinfo"
Thanks to Coverity for spotting this.

Signed-off-by: Maxin B. John <john.maxin@nokia.com>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
---

diff --git a/drivers/mtd/mtdswap.c b/drivers/mtd/mtdswap.c
index fed215c4cfa1..fd7885327611 100644
--- a/drivers/mtd/mtdswap.c
+++ b/drivers/mtd/mtdswap.c
@@ -1450,7 +1450,13 @@ static void mtdswap_add_mtd(struct mtd_blktrans_ops *tr, struct mtd_info *mtd)
 	}
 
 	oinfo = mtd->ecclayout;
-	if (!mtd->oobsize || !oinfo || oinfo->oobavail < MTDSWAP_OOBSIZE) {
+	if (!oinfo) {
+		printk(KERN_ERR "%s: mtd%d does not have OOB\n",
+			MTDSWAP_PREFIX, mtd->index);
+		return;
+	}
+
+	if (!mtd->oobsize || oinfo->oobavail < MTDSWAP_OOBSIZE) {
 		printk(KERN_ERR "%s: Not enough free bytes in OOB, "
 			"%d available, %zu needed.\n",
 			MTDSWAP_PREFIX, oinfo->oobavail, MTDSWAP_OOBSIZE);