exofs: check for allocation failure in uri_store()
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@ispras.ru>
Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
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_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;
}