linux-kernel - [PATCH][trivial] pcmcia: avoid static analysis complaint about use-after-free

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Message-ID: <alpine.LNX.2.00.1301202312420.8225@swampdragon.chaosbits.net>
Date:	Sun, 20 Jan 2013 23:14:43 +0100 (CET)
From:	Jesper Juhl <jj@...osbits.net>
To:	linux-kernel@...r.kernel.org
cc:	linux-pcmcia@...ts.infradead.org,
	Eric Miao <eric.y.miao@...il.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Bill Pemberton <wfp5p@...ginia.edu>, trivial@...nel.org
Subject: [PATCH][trivial] pcmcia: avoid static analysis complaint about
 use-after-free

Coverity complains about a use after free for 'res1' and 'res2' since
we use the value of the pointers in a 'dev_dbg()' after they have been
freed. That's not really a problem, but it still seems cleaner to
defer freeing until we are completely done with the pointers.

Signed-off-by: Jesper Juhl <jj@...osbits.net>
---
 drivers/pcmcia/rsrc_nonstatic.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/pcmcia/rsrc_nonstatic.c b/drivers/pcmcia/rsrc_nonstatic.c
index 430a9ac..065704c 100644
--- a/drivers/pcmcia/rsrc_nonstatic.c
+++ b/drivers/pcmcia/rsrc_nonstatic.c
@@ -369,12 +369,12 @@ static int do_validate_mem(struct pcmcia_socket *s,
 		}
 	}
 
-	free_region(res2);
-	free_region(res1);
-
 	dev_dbg(&s->dev, "cs: memory probe 0x%06lx-0x%06lx: %p %p %u %u %u",
 		base, base+size-1, res1, res2, ret, info1, info2);
 
+	free_region(res2);
+	free_region(res1);
+
 	if ((ret) || (info1 != info2) || (info1 == 0))
 		return -EINVAL;
 
-- 
1.7.1


-- 
Jesper Juhl <jj@...osbits.net>       http://www.chaosbits.net/
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