This is a note to let you know that I've just added the patch titled
fs: lockd: avoid possible wrong NULL parameter
to the 5.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
fs-lockd-avoid-possible-wrong-null-parameter.patch
and it can be found in the queue-5.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 3dd2ff4a136a7eca6c41973ba833f250a72e8f6c
Author: Su Hui <suhui@xxxxxxxxxxxx>
Date: Fri Aug 4 09:26:57 2023 +0800
fs: lockd: avoid possible wrong NULL parameter
[ 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>
diff --git a/fs/lockd/mon.c b/fs/lockd/mon.c
index 1d9488cf05348..87a0f207df0b9 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;
