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From: Nicholas Mc Guire <hofrat@osadl.org>
To: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Jessica Yu <jeyu@kernel.org>, Jiri Kosina <jikos@kernel.org>,
	Miroslav Benes <mbenes@suse.cz>, Petr Mladek <pmladek@suse.com>,
	live-patching@vger.kernel.org, linux-kernel@vger.kernel.org,
	Nicholas Mc Guire <hofrat@osadl.org>
Subject: [PATCH 1/2] livepatch: handle kzalloc failure
Date: Thu, 13 Dec 2018 12:09:49 +0100	[thread overview]
Message-ID: <1544699390-15673-1-git-send-email-hofrat@osadl.org> (raw)

kzalloc() return should always be checked - notably in example code
where this may be seen as reference. On failure of allocation
livepatch_fix1_dummy_alloc() should return NULL.

Signed-off-by: Nicholas Mc Guire <hofrat@osadl.org>
---

Problem was located with an experimental coccinelle script

Patch was compile tested with: x86_64_defconfig + FTRACE=y
FUNCTION_TRACER=y, EXPERT=y, LATENCYTOP=y, SAMPLES=y, SAMPLE_LIVEPATCH=y
(with some unrelated sparse warnings on symbols not being static)

Patch is against 4.20-rc6 (localversion-next is next-20181213)

 samples/livepatch/livepatch-shadow-fix1.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/samples/livepatch/livepatch-shadow-fix1.c b/samples/livepatch/livepatch-shadow-fix1.c
index 49b1355..a0e8f04 100644
--- a/samples/livepatch/livepatch-shadow-fix1.c
+++ b/samples/livepatch/livepatch-shadow-fix1.c
@@ -89,6 +89,9 @@ struct dummy *livepatch_fix1_dummy_alloc(void)
 	 * pointer to handle resource release.
 	 */
 	leak = kzalloc(sizeof(int), GFP_KERNEL);
+	if (!leak)
+		return NULL;
+
 	klp_shadow_alloc(d, SV_LEAK, sizeof(leak), GFP_KERNEL,
 			 shadow_leak_ctor, leak);
 
-- 
2.1.4


             reply	other threads:[~2018-12-13 11:14 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-12-13 11:09 Nicholas Mc Guire [this message]
2018-12-13 11:09 ` [PATCH 2/2] livepatch: handle kzalloc failure Nicholas Mc Guire
2018-12-13 12:33   ` Petr Mladek
2018-12-13 12:31 ` [PATCH 1/2] " Petr Mladek
2018-12-13 14:00   ` Nicholas Mc Guire

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