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| author | Jia-Ju Bai <baijiaju1990@163.com> | 2017-05-31 09:40:11 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-08-06 18:59:42 -0700 |
| commit | b756862459d2b8a977538e5f61345e3633c51d0f (patch) | |
| tree | e7a3a25ee12541d0cfb9852f532202b2f9a91715 | |
| parent | 6c78197e4a69c19e61dfe904fdc661b2aee8ec20 (diff) | |
| download | linux-stable-b756862459d2b8a977538e5f61345e3633c51d0f.tar.gz linux-stable-b756862459d2b8a977538e5f61345e3633c51d0f.tar.bz2 linux-stable-b756862459d2b8a977538e5f61345e3633c51d0f.zip | |
isdn: Fix a sleep-in-atomic bug
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@163.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Amit Pundir <amit.pundir@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/isdn/i4l/isdn_ppp.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/isdn/i4l/isdn_ppp.c b/drivers/isdn/i4l/isdn_ppp.c index 9c1e8adaf4fc..bf3fbd00a091 100644 --- 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_ppp_ccp_reset_alloc_state(struct ippp_s 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; |