linux-kernel - [PATCH] ntb: fix possible NULL dereference

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Message-Id: <1457612471-26128-1-git-send-email-sudipm.mukherjee@gmail.com>
Date:	Thu, 10 Mar 2016 17:51:11 +0530
From:	Sudip Mukherjee <sudipm.mukherjee@...il.com>
To:	Jon Mason <jdmason@...zu.us>, Dave Jiang <dave.jiang@...el.com>,
	Allen Hubbe <Allen.Hubbe@....com>
Cc:	linux-kernel@...r.kernel.org, linux-ntb@...glegroups.com,
	Sudip Mukherjee <sudipm.mukherjee@...il.com>
Subject: [PATCH] ntb: fix possible NULL dereference

kmalloc can fail and we should check for NULL before using the pointer
returned by kmalloc.

Signed-off-by: Sudip Mukherjee <sudip.mukherjee@...ethink.co.uk>
---
 drivers/ntb/test/ntb_perf.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/ntb/test/ntb_perf.c b/drivers/ntb/test/ntb_perf.c
index c8a37ba..b21e647 100644
--- a/drivers/ntb/test/ntb_perf.c
+++ b/drivers/ntb/test/ntb_perf.c
@@ -541,6 +541,8 @@ static ssize_t debugfs_run_read(struct file *filp, char __user *ubuf,
 		return 0;
 
 	buf = kmalloc(64, GFP_KERNEL);
+	if (!buf)
+		return -ENOMEM;
 	out_offset = snprintf(buf, 64, "%d\n", perf->run);
 	ret = simple_read_from_buffer(ubuf, count, offp, buf, out_offset);
 	kfree(buf);
-- 
1.9.1