This is a note to let you know that I've just added the patch titled
wifi: ath12k: fix read pointer after free in ath12k_mac_assign_vif_to_vdev()
to the 6.13-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-ath12k-fix-read-pointer-after-free-in-ath12k_ma.patch
and it can be found in the queue-6.13 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 4f77a466bf4ea94c4b6bab1a9bdafdb6bc1aea21
Author: Aditya Kumar Singh <quic_adisi@xxxxxxxxxxx>
Date: Tue Dec 10 10:56:33 2024 +0530
wifi: ath12k: fix read pointer after free in ath12k_mac_assign_vif_to_vdev()
[ Upstream commit 5a10971c7645a95f5d5dc23c26fbac4bf61801d0 ]
In ath12k_mac_assign_vif_to_vdev(), if arvif is created on a different
radio, it gets deleted from that radio through a call to
ath12k_mac_unassign_link_vif(). This action frees the arvif pointer.
Subsequently, there is a check involving arvif, which will result in a
read-after-free scenario.
Fix this by moving this check after arvif is again assigned via call to
ath12k_mac_assign_link_vif().
Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.3.1-00173-QCAHKSWPL_SILICONZ-1
Closes: https://scan5.scan.coverity.com/#/project-view/63541/10063?selectedIssue=1636423
Fixes: b5068bc9180d ("wifi: ath12k: Cache vdev configs before vdev create")
Signed-off-by: Aditya Kumar Singh <quic_adisi@xxxxxxxxxxx>
Acked-by: Jeff Johnson <jeff.johnson@xxxxxxxxxxxxxxxx>
Acked-by: Kalle Valo <kvalo@xxxxxxxxxx>
Link: https://patch.msgid.link/20241210-read_after_free-v1-1-969f69c7d66c@xxxxxxxxxxx
Signed-off-by: Jeff Johnson <jeff.johnson@xxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/net/wireless/ath/ath12k/mac.c b/drivers/net/wireless/ath/ath12k/mac.c
index d493ec812055f..cf4f4245f6068 100644
--- a/drivers/net/wireless/ath/ath12k/mac.c
+++ b/drivers/net/wireless/ath/ath12k/mac.c
@@ -7173,9 +7173,6 @@ static struct ath12k *ath12k_mac_assign_vif_to_vdev(struct ieee80211_hw *hw,
ab = ar->ab;
- if (arvif->is_created)
- goto flush;
-
/* Assign arvif again here since previous radio switch block
* would've unassigned and cleared it.
*/
@@ -7186,6 +7183,9 @@ static struct ath12k *ath12k_mac_assign_vif_to_vdev(struct ieee80211_hw *hw,
goto unlock;
}
+ if (arvif->is_created)
+ goto flush;
+
if (ar->num_created_vdevs > (TARGET_NUM_VDEVS - 1)) {
ath12k_warn(ab, "failed to create vdev, reached max vdev limit %d\n",
TARGET_NUM_VDEVS);
