Messages in this thread Patch in this message | | | From | Jia-Ju Bai <> | Subject | [PATCH] fs: nfs: Fix a sleep-in-atomic bug in nfs_access_add_cache | Date | Mon, 5 Jun 2017 16:05:04 +0800 |
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The driver may sleep under a rcu read lock, and function call path is: nfs_permission (acquire the lock by rcu_read_lock) nfs_do_access nfs_access_add_cache kmalloc(GFP_KERNEL) --> may sleep
To fix it, "GFP_KERNEL" is replaced with "GFP_ATOMIC".
Signed-off-by: Jia-Ju Bai <baijiaju1990@163.com> --- fs/nfs/dir.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c index 32ccd77..7a074db 100644 --- a/fs/nfs/dir.c +++ b/fs/nfs/dir.c @@ -2333,7 +2333,7 @@ static void nfs_access_add_rbtree(struct inode *inode, struct nfs_access_entry * void nfs_access_add_cache(struct inode *inode, struct nfs_access_entry *set) { - struct nfs_access_entry *cache = kmalloc(sizeof(*cache), GFP_KERNEL); + struct nfs_access_entry *cache = kmalloc(sizeof(*cache), GFP_ATOMIC); if (cache == NULL) return; RB_CLEAR_NODE(&cache->rb_node); -- 1.7.9.5
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