From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Dan Carpenter , Tilman Schmidt , "David S. Miller" Subject: [ 07/22] isdn/gigaset: fix zero size border case in debug dump Date: Tue, 12 Feb 2013 12:36:50 -0800 Message-Id: <20130212203414.892936342@linuxfoundation.org> In-Reply-To: <20130212203413.459836020@linuxfoundation.org> References: <20130212203413.459836020@linuxfoundation.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: 3.0-stable review patch. If anyone has any objections, please let me know. ------------------ From: Tilman Schmidt [ Upstream commit d721a1752ba544df8d7d36959038b26bc92bdf80 ] If subtracting 12 from l leaves zero we'd do a zero size allocation, leading to an oops later when we try to set the NUL terminator. Reported-by: Dan Carpenter Signed-off-by: Tilman Schmidt Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- drivers/isdn/gigaset/capi.c | 2 ++ 1 file changed, 2 insertions(+) --- a/drivers/isdn/gigaset/capi.c +++ b/drivers/isdn/gigaset/capi.c @@ -263,6 +263,8 @@ static inline void dump_rawmsg(enum debu CAPIMSG_APPID(data), CAPIMSG_MSGID(data), l, CAPIMSG_CONTROL(data)); l -= 12; + if (l <= 0) + return; dbgline = kmalloc(3*l, GFP_ATOMIC); if (!dbgline) return;