The kernel may sleep under a write spinlock, and the function call path is:
cachefiles_mark_object_active (acquire the spinlock)
cachefiles_printk_object
kmalloc(GFP_NOIO) --> may sleep
To fix it, GFP_NOIO is replaced with GFP_ATOMIC.
This bug is found by my static analysis tool and my code review.
Signed-off-by: Jia-Ju Bai <baijiaju1990@xxxxxxx>
---
fs/cachefiles/namei.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/cachefiles/namei.c b/fs/cachefiles/namei.c
index 3978b32..39e1504 100644
--- a/fs/cachefiles/namei.c
+++ b/fs/cachefiles/namei.c
@@ -83,7 +83,7 @@ static noinline void cachefiles_printk_object(struct cachefiles_object *object,
{
u8 *keybuf;
- keybuf = kmalloc(CACHEFILES_KEYBUF_SIZE, GFP_NOIO);
+ keybuf = kmalloc(CACHEFILES_KEYBUF_SIZE, GFP_ATOMIC);
if (object)
__cachefiles_printk_object(object, "", keybuf);
if (xobject)
--
1.7.9.5
