From 29021bccea0dc42d7d101004058438a9a4e693b1 Mon Sep 17 00:00:00 2001 From: J Freyensee Date: Wed, 25 May 2011 14:38:18 -0700 Subject: pti: double-free security PTI fix This patch fixes a double-free error that will not always be seen unless /dev/pti char interface is stressed. Signed-off-by: J Freyensee Signed-off-by: Greg Kroah-Hartman --- drivers/misc/pti.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) (limited to 'drivers/misc/pti.c') diff --git a/drivers/misc/pti.c b/drivers/misc/pti.c index bb6f9255c17c..be4857358d91 100644 --- a/drivers/misc/pti.c +++ b/drivers/misc/pti.c @@ -317,7 +317,8 @@ EXPORT_SYMBOL_GPL(pti_request_masterchannel); * a master, channel ID address * used to write to PTI HW. * - * @mc: master, channel apeture ID address to be released. + * @mc: master, channel apeture ID address to be released. This + * will de-allocate the structure via kfree(). */ void pti_release_masterchannel(struct pti_masterchannel *mc) { @@ -581,7 +582,7 @@ static int pti_char_open(struct inode *inode, struct file *filp) static int pti_char_release(struct inode *inode, struct file *filp) { pti_release_masterchannel(filp->private_data); - kfree(filp->private_data); + filp->private_data = NULL; return 0; } -- cgit v1.2.3