From: Julia Lawall <julia@diku.dk>
Date: Mon, 24 Jan 2011 19:55:19 +0000 (+0000)
Subject: fs/btrfs/inode.c: Add missing IS_ERR test
X-Git-Tag: v2.6.38-rc4~2^2~17
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=34d19bada00f4825588b338a8ee193820f9ceeb0;p=pandora-kernel.git

fs/btrfs/inode.c: Add missing IS_ERR test

After the conditional that precedes the following code, inode may be an
ERR_PTR value.  This can eg result from a memory allocation failure via the
call to btrfs_iget, and thus does not imply that root is different than
sub_root.  Thus, an IS_ERR check is added to ensure that there is no
dereference of inode in this case.

The semantic match that finds this problem is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@r@
identifier f;
@@
f(...) { ... return ERR_PTR(...); }

@@
identifier r.f, fld;
expression x;
statement S1,S2;
@@
 x = f(...)
 ... when != IS_ERR(x)
(
 if (IS_ERR(x) ||...) S1 else S2
|
*x->fld
)
// </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
---

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