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Old 07-27-2011, 03:20 PM
Andy Whitcroft
Default char/tpm: Fix unitialized usage of data buffer

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

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>

(cherry picked from commit 1309d7afbed112f0e8e90be9af975550caa0076b)
BugLink: http://bugs.launchpad.net/bugs/816546
Signed-off-by: Andy Whitcroft <apw@canonical.com>
drivers/char/tpm/tpm.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/char/tpm/tpm.c b/drivers/char/tpm/tpm.c
index 47c2d27..896fc94 100644
--- a/drivers/char/tpm/tpm.c
+++ b/drivers/char/tpm/tpm.c
@@ -953,7 +953,7 @@ 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);

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