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tracing: Fix null pointer deref with SEND_SIG_FORCED 

BUG: unable to handle kernel NULL pointer dereference at
	0000000000000006
IP: [<ffffffff8107bd37>] ftrace_raw_event_signal_generate+0x87/0x140

TP_STORE_SIGINFO() forgets about SEND_SIG_FORCED, fix.

We should probably export is_si_special() and change TP_STORE_SIGINFO()
to use it in the longer term.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Roland McGrath <roland@redhat.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Jason Baron <jbaron@redhat.com>
Cc: Masami Hiramatsu <mhiramat@redhat.com>
Cc: 2.6.33.x-2.6.34.x <stable@kernel.org>
LKML-Reference: <20100603213409.GA8307@redhat.com>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
This commit is contained in:
Oleg Nesterov 2010-06-03 23:34:09 +02:00 committed by Frederic Weisbecker
parent 58cc1a9e3b
commit b9b76dfaac
1 changed files with 2 additions and 1 deletions
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3
include/trace/events/signal.h
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@ -10,7 +10,8 @@
#define TP_STORE_SIGINFO(__entry, info) \
do { \
if (info == SEND_SIG_NOINFO) { \
if (info == SEND_SIG_NOINFO || \
info == SEND_SIG_FORCED) { \
__entry->errno = 0; \
__entry->code = SI_USER; \
} else if (info == SEND_SIG_PRIV) { \