[PATCH 5.4 147/367] fs: lockd: avoid possible wrong NULL parameter

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5.4-stable review patch.  If anyone has any objections, please let me know.


From: Su Hui <suhui@xxxxxxxxxxxx>

[ Upstream commit de8d38cf44bac43e83bad28357ba84784c412752 ]

clang's static analysis warning: fs/lockd/mon.c: line 293, column 2:
Null pointer passed as 2nd argument to memory copy function.

Assuming 'hostname' is NULL and calling 'nsm_create_handle()', this will
pass NULL as 2nd argument to memory copy function 'memcpy()'. So return
NULL if 'hostname' is invalid.

Fixes: 77a3ef33e2de ("NSM: More clean up of nsm_get_handle()")
Signed-off-by: Su Hui <suhui@xxxxxxxxxxxx>
Reviewed-by: Nick Desaulniers <ndesaulniers@xxxxxxxxxx>
Reviewed-by: Jeff Layton <jlayton@xxxxxxxxxx>
Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
 fs/lockd/mon.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/fs/lockd/mon.c b/fs/lockd/mon.c
index 1eabd91870e6f..d770a41f85695 100644
--- a/fs/lockd/mon.c
+++ b/fs/lockd/mon.c
@@ -276,6 +276,9 @@ static struct nsm_handle *nsm_create_handle(const struct sockaddr *sap,
 	struct nsm_handle *new;
+	if (!hostname)
+		return NULL;
 	new = kzalloc(sizeof(*new) + hostname_len + 1, GFP_KERNEL);
 	if (unlikely(new == NULL))
 		return NULL;

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