This is a note to let you know that I've just added the patch titled
net/mlx5: DR, prevent potential error pointer dereference
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:
net-mlx5-dr-prevent-potential-error-pointer-derefere.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 2b8f36bc073a7b87bce748787685616643cb33b2
Author: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Date: Wed Dec 4 15:06:41 2024 +0300
net/mlx5: DR, prevent potential error pointer dereference
[ Upstream commit 11776cff0b563c8b8a4fa76cab620bfb633a8cb8 ]
The dr_domain_add_vport_cap() function generally returns NULL on error
but sometimes we want it to return ERR_PTR(-EBUSY) so the caller can
retry. The problem here is that "ret" can be either -EBUSY or -ENOMEM
and if it's and -ENOMEM then the error pointer is propogated back and
eventually dereferenced in dr_ste_v0_build_src_gvmi_qpn_tag().
Fixes: 11a45def2e19 ("net/mlx5: DR, Add support for SF vports")
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Reviewed-by: Tariq Toukan <tariqt@xxxxxxxxxx>
Link: https://patch.msgid.link/07477254-e179-43e2-b1b3-3b9db4674195@stanley.mountain
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/steering/dr_domain.c b/drivers/net/ethernet/mellanox/mlx5/core/steering/dr_domain.c
index fc6ae49b5ecc..d462017c6a95 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/steering/dr_domain.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/steering/dr_domain.c
@@ -195,7 +195,9 @@ dr_domain_add_vport_cap(struct mlx5dr_domain *dmn, u16 vport)
if (ret) {
mlx5dr_dbg(dmn, "Couldn't insert new vport into xarray (%d)\n", ret);
kvfree(vport_caps);
- return ERR_PTR(ret);
+ if (ret == -EBUSY)
+ return ERR_PTR(-EBUSY);
+ return NULL;
}
return vport_caps;
