[PATCH] exofs: check for allocation failure in uri_store()

[Alexey Khoroshilov]

There is no memory allocation failure check in uri_store().
That can lead to NULL pointer dereference.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Alexey Khoroshilov <khoroshilov@xxxxxxxxx>
---
 fs/exofs/sys.c |    7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/fs/exofs/sys.c b/fs/exofs/sys.c
index 5a7b691..1b4f2f9 100644
--- a/fs/exofs/sys.c
+++ b/fs/exofs/sys.c
@@ -80,8 +80,13 @@ static ssize_t uri_show(struct exofs_dev *edp, char *buf)
 
 static ssize_t uri_store(struct exofs_dev *edp, const char *buf, size_t len)
 {
+	uint8_t *new_uri;
+
 	edp->urilen = strlen(buf) + 1;
-	edp->uri = krealloc(edp->uri, edp->urilen, GFP_KERNEL);
+	new_uri = krealloc(edp->uri, edp->urilen, GFP_KERNEL);
+	if (new_uri == NULL)
+		return -ENOMEM;
+	edp->uri = new_uri;
 	strncpy(edp->uri, buf, edp->urilen);
 	return edp->urilen;
 }
-- 
1.7.9.5

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