In gfs2_alloc_inode(), when kmem_cache_alloc() on line 1724 returns NULL, ip is assigned to NULL. In this case, "return &ip->i_inode" will cause a null-pointer dereference.
To fix this null-pointer dereference, NULL is returned when ip is NULL. This bug is found by a static analysis tool STCheck written by us. Signed-off-by: Jia-Ju Bai <baijiaju1...@gmail.com> --- fs/gfs2/super.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/fs/gfs2/super.c b/fs/gfs2/super.c index 0acc5834f653..c07c3f4f8451 100644 --- a/fs/gfs2/super.c +++ b/fs/gfs2/super.c @@ -1728,8 +1728,9 @@ static struct inode *gfs2_alloc_inode(struct super_block *sb) memset(&ip->i_res, 0, sizeof(ip->i_res)); RB_CLEAR_NODE(&ip->i_res.rs_node); ip->i_rahead = 0; - } - return &ip->i_inode; + return &ip->i_inode; + } else + return NULL; } static void gfs2_free_inode(struct inode *inode) -- 2.17.0