[PATCH] mtd: fix null pointer deference when kzalloc returns null

From	Colin King <colin.king@canonical.com>
Newsgroups	linux.kernel
Subject	[PATCH] mtd: fix null pointer deference when kzalloc returns null
Date	2015-07-17 12:40 +0200
Message-ID	<pNbdD-2PM-7@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

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From: Colin Ian King <colin.king@canonical.com>

static analysis by smatch caught the following error:

drivers/mtd/maps/physmap_of.c:135 of_get_probes()
   error: potential null dereference 'res'.  (kzalloc returns null)

Check for failed kzalloc and return -ENOMEM in of_flash_probe if
this occurs.

Signed-off-by: Colin Ian King <colin.king@canonical.com>
---
 drivers/mtd/maps/physmap_of.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/mtd/maps/physmap_of.c b/drivers/mtd/maps/physmap_of.c
index 774b32f..3e614e9 100644
--- a/drivers/mtd/maps/physmap_of.c
+++ b/drivers/mtd/maps/physmap_of.c
@@ -130,6 +130,8 @@ static const char * const *of_get_probes(struct device_node *dp)
 			count++;
 
 	res = kzalloc((count + 1)*sizeof(*res), GFP_KERNEL);
+	if (!res)
+		return NULL;
 	count = 0;
 	while (cplen > 0) {
 		res[count] = cp;
@@ -311,6 +313,10 @@ static int of_flash_probe(struct platform_device *dev)
 
 	ppdata.of_node = dp;
 	part_probe_types = of_get_probes(dp);
+	if (!part_probe_types) {
+		err = -ENOMEM;
+		goto err_out;
+	}
 	mtd_device_parse_register(info->cmtd, part_probe_types, &ppdata,
 			NULL, 0);
 	of_free_probes(part_probe_types);
-- 
2.1.4

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[PATCH] mtd: fix null pointer deference when kzalloc returns null Colin King <colin.king@canonical.com> - 2015-07-17 12:40 +0200

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