korg/linux
0
0
Fork 0
mirror of https://mirrors.bfsu.edu.cn/git/linux.git synced 2024-11-11 12:28:41 +08:00
Code Issues Packages Projects Releases Wiki Activity

xdp: Reset prog in dev_change_xdp_fd when fd is negative

Browse Source 
The commit mentioned in the Fixes tag reuses the local prog variable
when looking up an expected_fd. The variable is not reset when fd < 0
causing a detach with the expected_fd set to actually call
dev_xdp_install for the existing program. The end result is that the
detach does not happen.

Fixes: 92234c8f15 ("xdp: Support specifying expected existing program when attaching XDP")
Signed-off-by: David Ahern <dsahern@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Reviewed-by: Jakub Kicinski <kuba@kernel.org>
Reviewed-by: Toke Høiland-Jørgensen <toke@redhat.com>
Link: https://lore.kernel.org/bpf/20200412133204.43847-1-dsahern@kernel.org
This commit is contained in:
David Ahern 2020-04-12 07:32:04 -06:00 committed by Daniel Borkmann
parent 96b2eb6e77
commit dfa74909cb
1 changed files with 2 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
net/core/dev.c
View File

@ -8667,8 +8667,8 @@ int dev_change_xdp_fd(struct net_device *dev, struct netlink_ext_ack *extack,
const struct net_device_ops *ops = dev->netdev_ops;
enum bpf_netdev_command query;
u32 prog_id, expected_id = 0;
struct bpf_prog *prog = NULL;
bpf_op_t bpf_op, bpf_chk;
struct bpf_prog *prog;
bool offload;
int err;
@ -8734,6 +8734,7 @@ int dev_change_xdp_fd(struct net_device *dev, struct netlink_ext_ack *extack,
} else {
if (!prog_id)
return 0;
prog = NULL;
}
err = dev_xdp_install(dev, bpf_op, extack, flags, prog);