From 7319f1e6bcf04abd2eddb19747b0933a76f839ce Mon Sep 17 00:00:00 2001 From: Michael Buesch Date: Sun, 28 Oct 2007 15:16:50 +0100 Subject: [PATCH] rfkill: Use mutex_lock() at register and add sanity check Replace mutex_lock_interruptible() by mutex_lock() in rfkill_register(), as interruptible doesn't make sense there. Add a sanity check for rfkill->type, as that's used for an unchecked dereference in an array and might cause hard to debug crashes if the driver sets this to an invalid value. Signed-off-by: Michael Buesch Signed-off-by: Ivo van Doorn Signed-off-by: John W. Linville --- net/rfkill/rfkill.c | 20 +++++++++----------- 1 file changed, 9 insertions(+), 11 deletions(-) diff --git a/net/rfkill/rfkill.c b/net/rfkill/rfkill.c index bbfbb9e7a917..47e8cd0322c0 100644 --- a/net/rfkill/rfkill.c +++ b/net/rfkill/rfkill.c @@ -276,21 +276,17 @@ static struct class rfkill_class = { static int rfkill_add_switch(struct rfkill *rfkill) { - int retval; - - retval = mutex_lock_interruptible(&rfkill_mutex); - if (retval) - return retval; + int error; - retval = rfkill_toggle_radio(rfkill, rfkill_states[rfkill->type]); - if (retval) - goto out; + mutex_lock(&rfkill_mutex); - list_add_tail(&rfkill->node, &rfkill_list); + error = rfkill_toggle_radio(rfkill, rfkill_states[rfkill->type]); + if (!error) + list_add_tail(&rfkill->node, &rfkill_list); - out: mutex_unlock(&rfkill_mutex); - return retval; + + return error; } static void rfkill_remove_switch(struct rfkill *rfkill) @@ -387,6 +383,8 @@ int rfkill_register(struct rfkill *rfkill) if (!rfkill->toggle_radio) return -EINVAL; + if (rfkill->type >= RFKILL_TYPE_MAX) + return -EINVAL; snprintf(dev->bus_id, sizeof(dev->bus_id), "rfkill%ld", (long)atomic_inc_return(&rfkill_no) - 1); -- 2.20.1