linux-kernel - [patch -next] FMC: NULL dereference on allocation failure

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Message-ID: <20130619160101.GA29108@mwanda>
Date:	Wed, 19 Jun 2013 19:01:01 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Alessandro Rubini <rubini@...dd.com>
Cc:	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [patch -next] FMC: NULL dereference on allocation failure

If we don't allocate "arr" then the cleanup path will dereference it and
oops.

Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Acked-by: Alessandro Rubini <rubini@...dd.com>

diff --git a/drivers/fmc/fmc-sdb.c b/drivers/fmc/fmc-sdb.c
index 74fb326..79adc39 100644
--- a/drivers/fmc/fmc-sdb.c
+++ b/drivers/fmc/fmc-sdb.c
@@ -46,16 +46,17 @@ static struct sdb_array *__fmc_scan_sdb_tree(struct fmc_device *fmc,
 	onew = __sdb_rd(fmc, sdb_addr + 4, convert);
 	n = __be16_to_cpu(*(uint16_t *)&onew);
 	arr = kzalloc(sizeof(*arr), GFP_KERNEL);
-	if (arr) {
-		arr->record = kzalloc(sizeof(arr->record[0]) * n, GFP_KERNEL);
-		arr->subtree = kzalloc(sizeof(arr->subtree[0]) * n, GFP_KERNEL);
-	}
-	if (!arr || !arr->record || !arr->subtree) {
+	if (!arr)
+		return ERR_PTR(-ENOMEM);
+	arr->record = kzalloc(sizeof(arr->record[0]) * n, GFP_KERNEL);
+	arr->subtree = kzalloc(sizeof(arr->subtree[0]) * n, GFP_KERNEL);
+	if (!arr->record || !arr->subtree) {
 		kfree(arr->record);
 		kfree(arr->subtree);
 		kfree(arr);
 		return ERR_PTR(-ENOMEM);
 	}
+
 	arr->len = n;
 	arr->level = level;
 	arr->fmc = fmc;
--
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