This is a note to let you know that I've just added the patch titled
wifi: wilc1000: fix potential RCU dereference issue in wilc_parse_join_bss_param
to the 6.1-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:
wifi-wilc1000-fix-potential-rcu-dereference-issue-in.patch
and it can be found in the queue-6.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit b481a61d2b3e53c0e8a0477c78ddfdfa8eda81bc
Author: Jiawei Ye <jiawei.ye@xxxxxxxxxxx>
Date: Thu Aug 29 08:17:09 2024 +0000
wifi: wilc1000: fix potential RCU dereference issue in wilc_parse_join_bss_param
[ Upstream commit 6d7c6ae1efb1ff68bc01d79d94fdf0388f86cdd8 ]
In the `wilc_parse_join_bss_param` function, the TSF field of the `ies`
structure is accessed after the RCU read-side critical section is
unlocked. According to RCU usage rules, this is illegal. Reusing this
pointer can lead to unpredictable behavior, including accessing memory
that has been updated or causing use-after-free issues.
This possible bug was identified using a static analysis tool developed
by myself, specifically designed to detect RCU-related issues.
To address this, the TSF value is now stored in a local variable
`ies_tsf` before the RCU lock is released. The `param->tsf_lo` field is
then assigned using this local variable, ensuring that the TSF value is
safely accessed.
Fixes: 205c50306acf ("wifi: wilc1000: fix RCU usage in connect path")
Signed-off-by: Jiawei Ye <jiawei.ye@xxxxxxxxxxx>
Reviewed-by: Alexis Lothoré <alexis.lothore@xxxxxxxxxxx>
Signed-off-by: Kalle Valo <kvalo@xxxxxxxxxx>
Link: https://patch.msgid.link/tencent_466225AA599BA49627FB26F707EE17BC5407@xxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/net/wireless/microchip/wilc1000/hif.c b/drivers/net/wireless/microchip/wilc1000/hif.c
index 13853fda3e047..420a3998d9ab2 100644
--- a/drivers/net/wireless/microchip/wilc1000/hif.c
+++ b/drivers/net/wireless/microchip/wilc1000/hif.c
@@ -381,6 +381,7 @@ void *wilc_parse_join_bss_param(struct cfg80211_bss *bss,
struct wilc_join_bss_param *param;
u8 rates_len = 0;
int ies_len;
+ u64 ies_tsf;
int ret;
param = kzalloc(sizeof(*param), GFP_KERNEL);
@@ -396,6 +397,7 @@ void *wilc_parse_join_bss_param(struct cfg80211_bss *bss,
return NULL;
}
ies_len = ies->len;
+ ies_tsf = ies->tsf;
rcu_read_unlock();
param->beacon_period = cpu_to_le16(bss->beacon_interval);
@@ -451,7 +453,7 @@ void *wilc_parse_join_bss_param(struct cfg80211_bss *bss,
IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
(u8 *)&noa_attr, sizeof(noa_attr));
if (ret > 0) {
- param->tsf_lo = cpu_to_le32(ies->tsf);
+ param->tsf_lo = cpu_to_le32(ies_tsf);
param->noa_enabled = 1;
param->idx = noa_attr.index;
if (noa_attr.oppps_ctwindow & IEEE80211_P2P_OPPPS_ENABLE_BIT) {
