Commit 71d6857a authored by Tilman Schmidt's avatar Tilman Schmidt Committed by Greg Kroah-Hartman

isdn/gigaset: fix zero size border case in debug dump

[ Upstream commit d721a175 ]

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: default avatarDan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: default avatarTilman Schmidt <tilman@imap.cc>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 6856b63b
......@@ -263,6 +263,8 @@ static inline void dump_rawmsg(enum debuglevel level, const char *tag,
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;
......
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