linux-kernel - [PATCH] Memory leak in tpm_ascii_bios_measurements

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Date:	Thu, 19 Jul 2007 01:11:54 +0200
From:	Jesper Juhl <jesper.juhl@...il.com>
To:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Cc:	Seiji Munetoh <munetoh@...ibm.com>,
	Stefan Berger <stefanb@...ibm.com>,
	Reiner Sailer <sailer@...son.ibm.com>,
	Kylene Hall <kjhall@...ibm.com>, jesper.juhl@...il.com
Subject: [PATCH] Memory leak in tpm_ascii_bios_measurements_open() fix.

Ehlo,

Coverity found a memory leak in tpm_ascii_bios_measurements_open().

If "read_log(log)" fails, then we may leak 'log' and 
'log->bios_event_log'.

This patch should fix it, but please double check it. I don't know 
this code very well and the patch has only been compile tested.


Signed-off-by: Jesper Juhl <jesper.juhl@...il.com>
---

 drivers/char/tpm/tpm_bios.c |   11 ++++++++---
 1 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/char/tpm/tpm_bios.c b/drivers/char/tpm/tpm_bios.c
index 4eba32b..4b26ce4 100644
--- a/drivers/char/tpm/tpm_bios.c
+++ b/drivers/char/tpm/tpm_bios.c
@@ -427,7 +427,7 @@ static int tpm_ascii_bios_measurements_open(struct inode *inode,
 		return -ENOMEM;
 
 	if ((err = read_log(log)))
-		return err;
+		goto out_free;
 
 	/* now register seq file */
 	err = seq_open(file, &tpm_ascii_b_measurments_seqops);
@@ -435,10 +435,15 @@ static int tpm_ascii_bios_measurements_open(struct inode *inode,
 		seq = file->private_data;
 		seq->private = log;
 	} else {
-		kfree(log->bios_event_log);
-		kfree(log);
+		goto out_free;
 	}
+
+out:
 	return err;
+out_free:
+	kfree(log->bios_event_log);
+	kfree(log);
+	goto out;
 }
 
 const struct file_operations tpm_ascii_bios_measurements_ops = {


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