linux-kernel.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Pavel Skripkin <paskripkin@gmail.com>
To: paul@paul-moore.com, davem@davemloft.net, kuba@kernel.org
Cc: netdev@vger.kernel.org, linux-security-module@vger.kernel.org,
	linux-kernel@vger.kernel.org,
	Pavel Skripkin <paskripkin@gmail.com>,
	syzbot+cdd51ee2e6b0b2e18c0d@syzkaller.appspotmail.com
Subject: [PATCH RESEND] net: cipso: fix warnings in netlbl_cipsov4_add_std
Date: Tue, 27 Jul 2021 19:35:30 +0300	[thread overview]
Message-ID: <20210727163530.3057-1-paskripkin@gmail.com> (raw)

Syzbot reported warning in netlbl_cipsov4_add(). The
problem was in too big doi_def->map.std->lvl.local_size
passed to kcalloc(). Since this value comes from userpace there is
no need to warn if value is not correct.

The same problem may occur with other kcalloc() calls in
this function, so, I've added __GFP_NOWARN flag to all
kcalloc() calls there.

Reported-and-tested-by: syzbot+cdd51ee2e6b0b2e18c0d@syzkaller.appspotmail.com
Fixes: 96cb8e3313c7 ("[NetLabel]: CIPSOv4 and Unlabeled packet integration")
Acked-by: Paul Moore <paul@paul-moore.com>
Signed-off-by: Pavel Skripkin <paskripkin@gmail.com>
---
 net/netlabel/netlabel_cipso_v4.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/net/netlabel/netlabel_cipso_v4.c b/net/netlabel/netlabel_cipso_v4.c
index baf235721c43..000bb3da4f77 100644
--- a/net/netlabel/netlabel_cipso_v4.c
+++ b/net/netlabel/netlabel_cipso_v4.c
@@ -187,14 +187,14 @@ static int netlbl_cipsov4_add_std(struct genl_info *info,
 		}
 	doi_def->map.std->lvl.local = kcalloc(doi_def->map.std->lvl.local_size,
 					      sizeof(u32),
-					      GFP_KERNEL);
+					      GFP_KERNEL | __GFP_NOWARN);
 	if (doi_def->map.std->lvl.local == NULL) {
 		ret_val = -ENOMEM;
 		goto add_std_failure;
 	}
 	doi_def->map.std->lvl.cipso = kcalloc(doi_def->map.std->lvl.cipso_size,
 					      sizeof(u32),
-					      GFP_KERNEL);
+					      GFP_KERNEL | __GFP_NOWARN);
 	if (doi_def->map.std->lvl.cipso == NULL) {
 		ret_val = -ENOMEM;
 		goto add_std_failure;
@@ -263,7 +263,7 @@ static int netlbl_cipsov4_add_std(struct genl_info *info,
 		doi_def->map.std->cat.local = kcalloc(
 					      doi_def->map.std->cat.local_size,
 					      sizeof(u32),
-					      GFP_KERNEL);
+					      GFP_KERNEL | __GFP_NOWARN);
 		if (doi_def->map.std->cat.local == NULL) {
 			ret_val = -ENOMEM;
 			goto add_std_failure;
@@ -271,7 +271,7 @@ static int netlbl_cipsov4_add_std(struct genl_info *info,
 		doi_def->map.std->cat.cipso = kcalloc(
 					      doi_def->map.std->cat.cipso_size,
 					      sizeof(u32),
-					      GFP_KERNEL);
+					      GFP_KERNEL | __GFP_NOWARN);
 		if (doi_def->map.std->cat.cipso == NULL) {
 			ret_val = -ENOMEM;
 			goto add_std_failure;
-- 
2.32.0


             reply	other threads:[~2021-07-27 16:35 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-27 16:35 Pavel Skripkin [this message]
2021-07-27 20:00 ` patchwork-bot+netdevbpf

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20210727163530.3057-1-paskripkin@gmail.com \
    --to=paskripkin@gmail.com \
    --cc=davem@davemloft.net \
    --cc=kuba@kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-security-module@vger.kernel.org \
    --cc=netdev@vger.kernel.org \
    --cc=paul@paul-moore.com \
    --cc=syzbot+cdd51ee2e6b0b2e18c0d@syzkaller.appspotmail.com \
    --subject='Re: [PATCH RESEND] net: cipso: fix warnings in netlbl_cipsov4_add_std' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
on how to clone and mirror all data and code used for this inbox