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authorJiawei Ye <jiawei.ye@foxmail.com>2024-08-29 08:17:09 +0000
committerKalle Valo <kvalo@kernel.org>2024-09-09 15:28:47 +0300
commit6d7c6ae1efb1ff68bc01d79d94fdf0388f86cdd8 (patch)
tree91a05f6eb0f1ccc768ef3f089088725281efcc50
parent498365e52bebcbc36a93279fe7e9d6aec8479cee (diff)
wifi: wilc1000: fix potential RCU dereference issue in wilc_parse_join_bss_param
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@foxmail.com> Reviewed-by: Alexis Lothoré <alexis.lothore@bootlin.com> Signed-off-by: Kalle Valo <kvalo@kernel.org> Link: https://patch.msgid.link/tencent_466225AA599BA49627FB26F707EE17BC5407@qq.com
-rw-r--r--drivers/net/wireless/microchip/wilc1000/hif.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/net/wireless/microchip/wilc1000/hif.c b/drivers/net/wireless/microchip/wilc1000/hif.c
index 3c48e1a57b24..bba53307b960 100644
--- a/drivers/net/wireless/microchip/wilc1000/hif.c
+++ b/drivers/net/wireless/microchip/wilc1000/hif.c
@@ -384,6 +384,7 @@ 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);
@@ -399,6 +400,7 @@ 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);
@@ -454,7 +456,7 @@ 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) {