| From | Greg Kroah-Hartman <> | Subject | [ 15/36] isdn/gigaset: fix zero size border case in debug dump | Date | Tue, 12 Feb 2013 12:41:09 -0800 |
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3.4-stable review patch. If anyone has any objections, please let me know.
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From: Tilman Schmidt <tilman@imap.cc>
[ 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 <dan.carpenter@oracle.com> Signed-off-by: Tilman Schmidt <tilman@imap.cc> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- drivers/isdn/gigaset/capi.c | 2 ++ 1 file changed, 2 insertions(+)
--- a/drivers/isdn/gigaset/capi.c +++ b/drivers/isdn/gigaset/capi.c @@ -264,6 +264,8 @@ 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;
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