From d1c2f87c9a8f79fa8816bbe7de98da38eae2be5e Mon Sep 17 00:00:00 2001 From: Lee Jones Date: Wed, 23 Mar 2016 14:43:42 +0000 Subject: [PATCH] mailbox: mailbox-test: Prevent memory leak If we set the Signal twice or more, without using it as part of a message, memory will be re-allocated and the pointer over-written. Prevent this potential leak by only allocating memory when there isn't any already. Reported-by: Dan Carpenter Signed-off-by: Lee Jones Signed-off-by: Jassi Brar --- drivers/mailbox/mailbox-test.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/drivers/mailbox/mailbox-test.c b/drivers/mailbox/mailbox-test.c index 5f4b439fd45a..58d04726cdd7 100644 --- a/drivers/mailbox/mailbox-test.c +++ b/drivers/mailbox/mailbox-test.c @@ -59,9 +59,12 @@ static ssize_t mbox_test_signal_write(struct file *filp, return -EINVAL; } - tdev->signal = kzalloc(MBOX_MAX_SIG_LEN, GFP_KERNEL); - if (!tdev->signal) - return -ENOMEM; + /* Only allocate memory if we need to */ + if (!tdev->signal) { + tdev->signal = kzalloc(MBOX_MAX_SIG_LEN, GFP_KERNEL); + if (!tdev->signal) + return -ENOMEM; + } if (copy_from_user(tdev->signal, userbuf, count)) { kfree(tdev->signal); -- 2.30.2