[PATCH 5.8 170/633] staging: rtl8192u: Do not use GFP_KERNEL in atomic context

Greg Kroah-Hartman
2020-10-27T17:18:46Z

From: Christophe JAILLET <christophe.jaillet@wanadoo.fr>

[ Upstream commit acac75bb451fd39344eb54fad6602dfc9482e970 ]

'rtl8192_irq_rx_tasklet()' is a tasklet initialized in
'rtl8192_init_priv_task()'.
>From this function it is possible to allocate some memory with the
GFP_KERNEL flag, which is not allowed in the atomic context of a tasklet.

Use GFP_ATOMIC instead.

The call chain is:
rtl8192_irq_rx_tasklet (in r8192U_core.c)
--> rtl8192_rx_nomal (in r8192U_core.c)
--> ieee80211_rx (in ieee80211/ieee80211_rx.c)
--> RxReorderIndicatePacket (in ieee80211/ieee80211_rx.c)

Fixes: 79a5ccd97209 ("staging: rtl8192u: fix large frame size compiler warning")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Link: https://lore.kernel.org/r/20200813173458.758284-1-christophe.jaillet@wanadoo.fr
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/staging/rtl8192u/ieee80211/ieee80211_rx.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/rtl8192u/ieee80211/ieee80211_rx.c b/drivers/staging/rtl8192u/ieee80211/ieee80211_rx.c
index 195d963c4fbb4..b6fee7230ce05 100644
--- a/drivers/staging/rtl8192u/ieee80211/ieee80211_rx.c
+++ b/drivers/staging/rtl8192u/ieee80211/ieee80211_rx.c
@@ -597,7 +597,7 @@ static void RxReorderIndicatePacket(struct ieee80211_device *ieee,

prxbIndicateArray = kmalloc_array(REORDER_WIN_SIZE,
sizeof(struct ieee80211_rxb *),
- GFP_KERNEL);
+ GFP_ATOMIC);
if (!prxbIndicateArray)
return;

--
2.25.1