6.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Su Hui suhui@nfschina.com
[ 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@nfschina.com Reviewed-by: Nick Desaulniers ndesaulniers@google.com Reviewed-by: Jeff Layton jlayton@kernel.org Signed-off-by: Chuck Lever chuck.lever@oracle.com Signed-off-by: Sasha Levin sashal@kernel.org --- fs/lockd/mon.c | 3 +++ 1 file changed, 3 insertions(+)
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;