From 28e8190d2fb3918b5d46acafeb1968cd26e30dad Mon Sep 17 00:00:00 2001 From: Markus Elfring Date: Sat, 20 Aug 2016 08:54:15 +0200 Subject: [PATCH] tun: Use memdup_user() rather than duplicating its implementation Reuse existing functionality from memdup_user() instead of keeping duplicate source code. This issue was detected by using the Coccinelle software. Signed-off-by: Markus Elfring Reviewed-by: Shmulik Ladkani Signed-off-by: David S. Miller --- drivers/net/tun.c | 11 +++-------- 1 file changed, 3 insertions(+), 8 deletions(-) diff --git a/drivers/net/tun.c b/drivers/net/tun.c index 9c8b5bc2b9d8..a1aeccbce6d4 100644 --- a/drivers/net/tun.c +++ b/drivers/net/tun.c @@ -731,14 +731,9 @@ static int update_filter(struct tap_filter *filter, void __user *arg) } alen = ETH_ALEN * uf.count; - addr = kmalloc(alen, GFP_KERNEL); - if (!addr) - return -ENOMEM; - - if (copy_from_user(addr, arg + sizeof(uf), alen)) { - err = -EFAULT; - goto done; - } + addr = memdup_user(arg + sizeof(uf), alen); + if (IS_ERR(addr)) + return PTR_ERR(addr); /* The filter is updated without holding any locks. Which is * perfectly safe. We disable it first and in the worst -- 2.20.1