This is a note to let you know that I've just added the patch titled
net: sparx5: Fix use after free inside sparx5_del_mact_entry
to the 5.15-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:
net-sparx5-fix-use-after-free-inside-sparx5_del_mact.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 950f86dc949807e2a5bcc9a672d41ff7f39ea280
Author: Horatiu Vultur <horatiu.vultur@xxxxxxxxxxxxx>
Date: Fri Mar 1 09:06:08 2024 +0100
net: sparx5: Fix use after free inside sparx5_del_mact_entry
[ Upstream commit 89d72d4125e94aa3c2140fedd97ce07ba9e37674 ]
Based on the static analyzis of the code it looks like when an entry
from the MAC table was removed, the entry was still used after being
freed. More precise the vid of the mac_entry was used after calling
devm_kfree on the mac_entry.
The fix consists in first using the vid of the mac_entry to delete the
entry from the HW and after that to free it.
Fixes: b37a1bae742f ("net: sparx5: add mactable support")
Signed-off-by: Horatiu Vultur <horatiu.vultur@xxxxxxxxxxxxx>
Reviewed-by: Simon Horman <horms@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20240301080608.3053468-1-horatiu.vultur@xxxxxxxxxxxxx
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/net/ethernet/microchip/sparx5/sparx5_mactable.c b/drivers/net/ethernet/microchip/sparx5/sparx5_mactable.c
index 9a8e4f201eb1f..6ba93fa984f26 100644
--- a/drivers/net/ethernet/microchip/sparx5/sparx5_mactable.c
+++ b/drivers/net/ethernet/microchip/sparx5/sparx5_mactable.c
@@ -344,10 +344,10 @@ int sparx5_del_mact_entry(struct sparx5 *sparx5,
list) {
if ((vid == 0 || mact_entry->vid == vid) &&
ether_addr_equal(addr, mact_entry->mac)) {
+ sparx5_mact_forget(sparx5, addr, mact_entry->vid);
+
list_del(&mact_entry->list);
devm_kfree(sparx5->dev, mact_entry);
-
- sparx5_mact_forget(sparx5, addr, mact_entry->vid);
}
}
mutex_unlock(&sparx5->mact_lock);
