From e8a285b7b10029c3da7e9bbaa1659e7e08178912 Mon Sep 17 00:00:00 2001 From: Jesper Juhl Date: Tue, 16 Oct 2007 01:27:52 -0700 Subject: [PATCH] isdn: guard against a potential NULL pointer dereference in old_capi_manufacturer() In drivers/isdn/capi/kcapi.c::old_capi_manufacturer(), if the call to get_capi_ctr_by_nr(ldef.contr); in line 823 returns NULL, then we'll be dereferencing a NULL pointer in the very next line. (Found by Coverity checker as bug #402) Signed-off-by: Jesper Juhl Acked-by: Karsten Keil Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/isdn/capi/kcapi.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/isdn/capi/kcapi.c b/drivers/isdn/capi/kcapi.c index 9f73bc2727..f555318693 100644 --- a/drivers/isdn/capi/kcapi.c +++ b/drivers/isdn/capi/kcapi.c @@ -821,6 +821,8 @@ static int old_capi_manufacturer(unsigned int cmd, void __user *data) return -EFAULT; } card = get_capi_ctr_by_nr(ldef.contr); + if (!card) + return -EINVAL; card = capi_ctr_get(card); if (!card) return -ESRCH; -- 2.39.5