On Mon, 30 Aug 2021 10:17:05 -0400 Paul Moore wrote:

On Mon, Aug 30, 2021 at 6:28 AM 王贇 [off-list ref] wrote:

quoted

In netlbl_cipsov4_add_std() when 'doi_def->map.std' alloc
failed, we sometime observe panic:

  BUG: kernel NULL pointer dereference, address:
  ...
  RIP: 0010:cipso_v4_doi_free+0x3a/0x80
  ...
  Call Trace:
   netlbl_cipsov4_add_std+0xf4/0x8c0
   netlbl_cipsov4_add+0x13f/0x1b0
   genl_family_rcv_msg_doit.isra.15+0x132/0x170
   genl_rcv_msg+0x125/0x240

This is because in cipso_v4_doi_free() there is no check
on 'doi_def->map.std' when doi_def->type got value 1, which
is possibe, since netlbl_cipsov4_add_std() haven't initialize
it before alloc 'doi_def->map.std'.

This patch just add the check to prevent panic happen in similar
cases.

Reported-by: Abaci <redacted>
Signed-off-by: Michael Wang <redacted>
---
 net/netlabel/netlabel_cipso_v4.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)  

I see this was already merged, but it looks good to me, thanks for
making those changes.

FWIW it looks like v1 was also merged:

https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/?id=733c99ee8b