This is a note to let you know that I've just added the patch titled
net/mlx5e: fix a potential double-free in fs_udp_create_groups
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-mlx5e-fix-a-potential-double-free-in-fs_udp_crea.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 d3ef61f0ecc8f2805a09e8ce0dd0a6e5c5281574
Author: Dinghao Liu <dinghao.liu@xxxxxxxxxx>
Date: Tue Nov 28 17:40:53 2023 +0800
net/mlx5e: fix a potential double-free in fs_udp_create_groups
[ Upstream commit e75efc6466ae289e599fb12a5a86545dff245c65 ]
When kcalloc() for ft->g succeeds but kvzalloc() for in fails,
fs_udp_create_groups() will free ft->g. However, its caller
fs_udp_create_table() will free ft->g again through calling
mlx5e_destroy_flow_table(), which will lead to a double-free.
Fix this by setting ft->g to NULL in fs_udp_create_groups().
Fixes: 1c80bd684388 ("net/mlx5e: Introduce Flow Steering UDP API")
Signed-off-by: Dinghao Liu <dinghao.liu@xxxxxxxxxx>
Reviewed-by: Tariq Toukan <tariqt@xxxxxxxxxx>
Reviewed-by: Simon Horman <horms@xxxxxxxxxx>
Signed-off-by: Saeed Mahameed <saeedm@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/fs_tt_redirect.c b/drivers/net/ethernet/mellanox/mlx5/core/en/fs_tt_redirect.c
index 7aa25a5e29d73..b26edbc53cad2 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en/fs_tt_redirect.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/fs_tt_redirect.c
@@ -156,6 +156,7 @@ static int fs_udp_create_groups(struct mlx5e_flow_table *ft, enum fs_udp_type ty
in = kvzalloc(inlen, GFP_KERNEL);
if (!in || !ft->g) {
kfree(ft->g);
+ ft->g = NULL;
kvfree(in);
return -ENOMEM;
}
