From 3265949f7cd36a724a35020202c618094be1cf28 Mon Sep 17 00:00:00 2001 From: Xiu Jianfeng Date: Fri, 21 Oct 2022 17:36:02 +0800 Subject: [PATCH] apparmor: Fix memleak issue in unpack_profile() Before aa_alloc_profile(), it has allocated string for @*ns_name if @tmpns is not NULL, so directly return -ENOMEM if aa_alloc_profile() failed will cause a memleak issue, and even if aa_alloc_profile() succeed, in the @fail_profile tag of aa_unpack(), it need to free @ns_name as well, this patch fixes them. Fixes: 736ec752d95e ("AppArmor: policy routines for loading and unpacking policy") Fixes: 04dc715e24d0 ("apparmor: audit policy ns specified in policy load") Signed-off-by: Xiu Jianfeng Signed-off-by: John Johansen --- security/apparmor/policy_unpack.c | 15 ++++++++++++--- 1 file changed, 12 insertions(+), 3 deletions(-) diff --git a/security/apparmor/policy_unpack.c b/security/apparmor/policy_unpack.c index 2e028d540c6b..1bf8cfb8700a 100644 --- a/security/apparmor/policy_unpack.c +++ b/security/apparmor/policy_unpack.c @@ -858,8 +858,11 @@ static struct aa_profile *unpack_profile(struct aa_ext *e, char **ns_name) } profile = aa_alloc_profile(name, NULL, GFP_KERNEL); - if (!profile) - return ERR_PTR(-ENOMEM); + if (!profile) { + info = "out of memory"; + error = -ENOMEM; + goto fail; + } rules = list_first_entry(&profile->rules, typeof(*rules), list); /* profile renaming is optional */ @@ -1090,6 +1093,10 @@ static struct aa_profile *unpack_profile(struct aa_ext *e, char **ns_name) if (error == 0) /* default error covers most cases */ error = -EPROTO; + if (*ns_name) { + kfree(*ns_name); + *ns_name = NULL; + } if (profile) name = NULL; else if (!name) @@ -1392,6 +1399,7 @@ int aa_unpack(struct aa_loaddata *udata, struct list_head *lh, { struct aa_load_ent *tmp, *ent; struct aa_profile *profile = NULL; + char *ns_name = NULL; int error; struct aa_ext e = { .start = udata->data, @@ -1401,7 +1409,6 @@ int aa_unpack(struct aa_loaddata *udata, struct list_head *lh, *ns = NULL; while (e.pos < e.end) { - char *ns_name = NULL; void *start; error = verify_header(&e, e.pos == e.start, ns); if (error) @@ -1432,6 +1439,7 @@ int aa_unpack(struct aa_loaddata *udata, struct list_head *lh, ent->new = profile; ent->ns_name = ns_name; + ns_name = NULL; list_add_tail(&ent->list, lh); } udata->abi = e.version & K_ABI_MASK; @@ -1452,6 +1460,7 @@ int aa_unpack(struct aa_loaddata *udata, struct list_head *lh, return 0; fail_profile: + kfree(ns_name); aa_put_profile(profile); fail: