This is a note to let you know that I've just added the patch titled
isdn: Fix a sleep-in-atomic bug
to the 4.4-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:
isdn-fix-a-sleep-in-atomic-bug.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From e8f4ae85439f34bec3b0ab69223a41809dab28c9 Mon Sep 17 00:00:00 2001
From: Jia-Ju Bai <baijiaju1990@xxxxxxx>
Date: Wed, 31 May 2017 09:40:11 +0800
Subject: isdn: Fix a sleep-in-atomic bug
From: Jia-Ju Bai <baijiaju1990@xxxxxxx>
commit e8f4ae85439f34bec3b0ab69223a41809dab28c9 upstream.
The driver may sleep under a spin lock, the function call path is:
isdn_ppp_mp_receive (acquire the lock)
isdn_ppp_mp_reassembly
isdn_ppp_push_higher
isdn_ppp_decompress
isdn_ppp_ccp_reset_trans
isdn_ppp_ccp_reset_alloc_state
kzalloc(GFP_KERNEL) --> may sleep
To fixed it, the "GFP_KERNEL" is replaced with "GFP_ATOMIC".
Signed-off-by: Jia-Ju Bai <baijiaju1990@xxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Amit Pundir <amit.pundir@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/isdn/i4l/isdn_ppp.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/isdn/i4l/isdn_ppp.c
+++ b/drivers/isdn/i4l/isdn_ppp.c
@@ -2364,7 +2364,7 @@ static struct ippp_ccp_reset_state *isdn
id);
return NULL;
} else {
- rs = kzalloc(sizeof(struct ippp_ccp_reset_state), GFP_KERNEL);
+ rs = kzalloc(sizeof(struct ippp_ccp_reset_state), GFP_ATOMIC);
if (!rs)
return NULL;
rs->state = CCPResetIdle;
Patches currently in stable-queue which might be from baijiaju1990@xxxxxxx are
queue-4.4/isdn-fix-a-sleep-in-atomic-bug.patch