linuxmsm/laptops-kernel
0
0
Fork 0
mirror of https://github.com/linux-msm/laptops-kernel.git synced 2026-08-13 14:19:53 -07:00
Code Issues Packages Projects Releases Wiki Activity

xfrm: fix xfrm_state_construct() auth-trunc leak

Browse Source 
attach_auth_trunc() can allocate x->aalg while leaving
x->props.aalgo at zero when the selected auth algorithm has no
sadb_alg_id. One real case is cmac(aes).

xfrm_state_construct() then treats !x->props.aalgo as "no auth
algorithm attached yet" and calls attach_auth(). That overwrites
x->aalg and loses the first allocation. Any later failure or teardown
only frees the replacement pointer.

Check whether x->aalg is already attached instead of inferring that
state from x->props.aalgo.

Fixes: 4447bb33f0 ("xfrm: Store aalg in xfrm_state with a user specified truncation length")
Cc: stable@vger.kernel.org
Reported-by: Vega <vega@nebusec.ai>
Assisted-by: Codex:gpt-5.4
Signed-off-by: Zihan Xi <zihanx@nebusec.ai>
Signed-off-by: Ren Wei <enjou1224z@gmail.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
This commit is contained in:
Zihan Xi
2026-07-28 10:48:18 +02:00
committed by Steffen Klassert
parent 7bad4bda74
commit c12cbf5632
1 changed files with 1 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files
net/xfrm/xfrm_user.c
+1 -1
View File
@@ -940,7 +940,7 @@ static struct xfrm_state *xfrm_state_construct(struct net *net,
if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo,
attrs[XFRMA_ALG_AUTH_TRUNC], extack)))
goto error;
if (!x->props.aalgo) {
if (!x->aalg) {
if ((err = attach_auth(&x->aalg, &x->props.aalgo,
attrs[XFRMA_ALG_AUTH], extack)))
goto error;