| Message ID | 20220224221525.147744-1-colin.i.king@gmail.com (mailing list archive) |
|---|---|
| State | Not Applicable |
| Headers | show |
| Series | net/mlx5e: Fix return of a kfree'd object instead of NULL | expand |
On 2022-02-25 12:15 AM, Colin Ian King wrote: > Currently in the case where parse_attr fails to be allocated the memory > pointed to by attr2 is kfree'd but the non-null pointer attr2 is returned > and a potential use of a kfree'd object can occur. Fix this by returning > NULL to indicate a memory allocation error. > > Addresses issue found by clang-scan: > drivers/net/ethernet/mellanox/mlx5/core/en_tc.c:3401:3: warning: Use of > memory after it is freed [unix.Malloc] > > Fixes: 8300f225268b ("net/mlx5e: Create new flow attr for multi table actions") > Signed-off-by: Colin Ian King <colin.i.king@gmail.com> > --- > drivers/net/ethernet/mellanox/mlx5/core/en_tc.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c > index 76a015dfc5fc..c0776a4a3845 100644 > --- a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c > +++ b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c > @@ -3398,7 +3398,7 @@ mlx5e_clone_flow_attr_for_post_act(struct mlx5_flow_attr *attr, > if (!attr2 || !parse_attr) { > kvfree(parse_attr); > kfree(attr2); > - return attr2; > + return NULL; > } > > memcpy(attr2, attr, attr_sz); thanks! Reviewed-by: Roi Dayan <roid@nvidia.com>
On 24 Feb 22:15, Colin Ian King wrote: >Currently in the case where parse_attr fails to be allocated the memory >pointed to by attr2 is kfree'd but the non-null pointer attr2 is returned >and a potential use of a kfree'd object can occur. Fix this by returning >NULL to indicate a memory allocation error. > >Addresses issue found by clang-scan: >drivers/net/ethernet/mellanox/mlx5/core/en_tc.c:3401:3: warning: Use of >memory after it is freed [unix.Malloc] > >Fixes: 8300f225268b ("net/mlx5e: Create new flow attr for multi table actions") >Signed-off-by: Colin Ian King <colin.i.king@gmail.com> Applied to net-next-mlx5 Thanks.
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c index 76a015dfc5fc..c0776a4a3845 100644 --- a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c +++ b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c @@ -3398,7 +3398,7 @@ mlx5e_clone_flow_attr_for_post_act(struct mlx5_flow_attr *attr, if (!attr2 || !parse_attr) { kvfree(parse_attr); kfree(attr2); - return attr2; + return NULL; } memcpy(attr2, attr, attr_sz);
Currently in the case where parse_attr fails to be allocated the memory pointed to by attr2 is kfree'd but the non-null pointer attr2 is returned and a potential use of a kfree'd object can occur. Fix this by returning NULL to indicate a memory allocation error. Addresses issue found by clang-scan: drivers/net/ethernet/mellanox/mlx5/core/en_tc.c:3401:3: warning: Use of memory after it is freed [unix.Malloc] Fixes: 8300f225268b ("net/mlx5e: Create new flow attr for multi table actions") Signed-off-by: Colin Ian King <colin.i.king@gmail.com> --- drivers/net/ethernet/mellanox/mlx5/core/en_tc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)