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authorTilman Schmidt <tilman@imap.cc>2013-01-21 15:57:21 +0400
committerDavid S. Miller <davem@davemloft.net>2013-01-22 02:36:02 +0400
commitd721a1752ba544df8d7d36959038b26bc92bdf80 (patch)
treed119c0f503bf75925ba005c94f286f6585dafaef /drivers/isdn/gigaset
parent2f62d5aa2879dc380881b2c74d042051dbb60bc8 (diff)
downloadlinux-d721a1752ba544df8d7d36959038b26bc92bdf80.tar.xz
isdn/gigaset: fix zero size border case in debug dump
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 <dan.carpenter@oracle.com> Signed-off-by: Tilman Schmidt <tilman@imap.cc> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/isdn/gigaset')
-rw-r--r--drivers/isdn/gigaset/capi.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/isdn/gigaset/capi.c b/drivers/isdn/gigaset/capi.c
index 68452b768da2..03a0a01a4054 100644
--- a/drivers/isdn/gigaset/capi.c
+++ b/drivers/isdn/gigaset/capi.c
@@ -248,6 +248,8 @@ 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;