linux-kernel - [PATCH 1/3 RFC] ARM: mvebu: at least warn on kzalloc failure

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Date:   Sun, 14 Apr 2019 06:49:49 +0200
From:   Nicholas Mc Guire <hofrat@...dl.org>
To:     Jason Cooper <jason@...edaemon.net>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Gregory Clement <gregory.clement@...tlin.com>,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
        Russell King <linux@...linux.org.uk>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Nicholas Mc Guire <hofrat@...dl.org>
Subject: [PATCH 1/3 RFC] ARM: mvebu: at least warn on kzalloc failure

Although it is very unlikely that the allocation during init would
fail any such failure should point to the original cause rather
than waiting for a null-pointer dereference to splat.

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

Problem located with experimental coccinelle script

While this will not really help much - but kzalloc failures should not
go unhandled. 

Patch was compile-tested: mvebu_v7_defconfig (implies MACH_MVEBU_ANY=y)
(with some unrelated sparse warnings about missing syscalls)

Patch is against 5.1-rc4 (localversion-next is 20190412)

 arch/arm/mach-mvebu/board-v7.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/mach-mvebu/board-v7.c b/arch/arm/mach-mvebu/board-v7.c
index 0b10acd..37f8cb6 100644
--- a/arch/arm/mach-mvebu/board-v7.c
+++ b/arch/arm/mach-mvebu/board-v7.c
@@ -128,6 +128,7 @@ static void __init i2c_quirk(void)
 		struct property *new_compat;
 
 		new_compat = kzalloc(sizeof(*new_compat), GFP_KERNEL);
+		WARN_ON(!new_compat);
 
 		new_compat->name = kstrdup("compatible", GFP_KERNEL);
 		new_compat->length = sizeof("marvell,mv78230-a0-i2c");
-- 
2.1.4