xfrm: fix uctx len check in verify_sec_ctx_len

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It's not sufficient to do 'uctx->len != (sizeof(struct xfrm_user_sec_ctx) +
uctx->ctx_len)' check only, as uctx->len may be greater than nla_len(rt),
in which case it will cause slab-out-of-bounds when accessing uctx->ctx_str
later.

This patch is to fix it by return -EINVAL when uctx->len > nla_len(rt).

Fixes: df71837d50 ("[LSM-IPSec]: Security association restriction.")
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>

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Xin Long 2020-02-09 21:15:29 +08:00 • committed by Steffen Klassert

parent f1ed10264e

commit 171d449a02

1 changed files with 2 additions and 1 deletions

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net/xfrm/xfrm_user.c

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