From: Jesper Juhl <jesper.juhl@gmail.com>
Date: Wed, 8 Aug 2007 01:10:54 +0000 (-0700)
Subject: [NETFILTER]: ipt_recent: avoid a possible NULL pointer deref in recent_seq_open()
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=3af8e31cf57646284b5f77f9d57d2c22fa77485a;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git

[NETFILTER]: ipt_recent: avoid a possible NULL pointer deref in recent_seq_open()

If the call to seq_open() returns != 0 then the code calls
kfree(st) but then on the very next line proceeds to
dereference the pointer - not good.

Problem spotted by the Coverity checker.

Signed-off-by: Jesper Juhl <jesper.juhl@gmail.com>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/ipv4/netfilter/ipt_recent.c b/net/ipv4/netfilter/ipt_recent.c
index 321804315659..6d0c0f7364ad 100644
--- a/net/ipv4/netfilter/ipt_recent.c
+++ b/net/ipv4/netfilter/ipt_recent.c
@@ -387,12 +387,17 @@ static int recent_seq_open(struct inode *inode, struct file *file)
 	st = kzalloc(sizeof(*st), GFP_KERNEL);
 	if (st == NULL)
 		return -ENOMEM;
+
 	ret = seq_open(file, &recent_seq_ops);
-	if (ret)
+	if (ret) {
 		kfree(st);
+		goto out;
+	}
+
 	st->table    = pde->data;
 	seq          = file->private_data;
 	seq->private = st;
+out:
 	return ret;
 }