linux-kernel - [PATCH] [29/106] char/tpm: Fix unitialized usage of data buffer

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Message-Id: <20110426211308.462513E1886@tassilo.jf.intel.com>
Date:	Tue, 26 Apr 2011 14:13:08 -0700 (PDT)
From:	Andi Kleen <andi@...stfloor.org>
To:	huewe.external.infineon@...glemail.com,
	huewe.external@...ineon.com, m.selhorst@...rix.com,
	ak@...ux.intel.com, torvalds@...ux-foundation.org, gregkh@...e.de,
	linux-kernel@...r.kernel.org, stable@...nel.org,
	tim.bird@...sony.com
Subject: [PATCH] [29/106] char/tpm: Fix unitialized usage of data buffer

2.6.35-longterm review patch.  If anyone has any objections, please let me know.

------------------
From: Peter Huewe <huewe.external.infineon@...glemail.com>

commit 1309d7afbed112f0e8e90be9af975550caa0076b upstream.

This patch fixes information leakage to the userspace by initializing
the data buffer to zero.

Reported-by: Peter Huewe <huewe.external@...ineon.com>
Signed-off-by: Peter Huewe <huewe.external@...ineon.com>
Signed-off-by: Marcel Selhorst <m.selhorst@...rix.com>
Signed-off-by: Andi Kleen <ak@...ux.intel.com>
[ Also removed the silly "* sizeof(u8)".  If that isn't 1, we have way
  deeper problems than a simple multiplication can fix.   - Linus ]
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/char/tpm/tpm.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: linux-2.6.35.y/drivers/char/tpm/tpm.c
===================================================================
--- linux-2.6.35.y.orig/drivers/char/tpm/tpm.c
+++ linux-2.6.35.y/drivers/char/tpm/tpm.c
@@ -970,7 +970,7 @@ int tpm_open(struct inode *inode, struct
 		return -EBUSY;
 	}

-	chip->data_buffer = kmalloc(TPM_BUFSIZE * sizeof(u8), GFP_KERNEL);
+	chip->data_buffer = kzalloc(TPM_BUFSIZE, GFP_KERNEL);
 	if (chip->data_buffer == NULL) {
 		clear_bit(0, &chip->is_open);
 		put_device(chip->dev);
--
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