From 1309d7afbed112f0e8e90be9af975550caa0076b Mon Sep 17 00:00:00 2001
From: Peter Huewe <huewe.external.infineon@googlemail.com>
Date: Tue, 29 Mar 2011 13:31:25 +0200
Subject: [PATCH] char/tpm: Fix unitialized usage of data buffer
This patch fixes information leakage to the userspace by initializing
the data buffer to zero.
Reported-by: Peter Huewe <huewe.external@infineon.com>
Signed-off-by: Peter Huewe <huewe.external@infineon.com>
Signed-off-by: Marcel Selhorst <m.selhorst@sirrix.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@linux-foundation.org>
---
drivers/char/tpm/tpm.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/char/tpm/tpm.c b/drivers/char/tpm/tpm.c
index 1f46f1cd9225..7beb0e25f1e1 100644
--- a/drivers/char/tpm/tpm.c
+++ b/drivers/char/tpm/tpm.c
@@ -980,7 +980,7 @@ int tpm_open(struct inode *inode, struct file *file)
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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