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authorLi Zefan <lizf@cn.fujitsu.com>2009-03-24 16:05:27 +0800
committerIngo Molnar <mingo@elte.hu>2009-03-31 17:27:18 +0200
commiteb08f8eb0673d9c1e62b69ad1b41593e73c40467 (patch)
tree8243201d6f98e5e502fd0688c632e9650c1f973d /kernel
parent5554720482a631702146a959db22fe417740e0a6 (diff)
blktrace: fix off-by-one bug
'what' is used as the index of array what2act, so it can't >= the array size. Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> Acked-by: Jens Axboe <jens.axboe@oracle.com> Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com> Acked-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/trace/blktrace.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c
index a7f7ff5db38..d43cdac7c75 100644
--- a/kernel/trace/blktrace.c
+++ b/kernel/trace/blktrace.c
@@ -1152,7 +1152,7 @@ static enum print_line_t blk_trace_event_print(struct trace_iterator *iter,
if (!trace_print_context(iter))
return TRACE_TYPE_PARTIAL_LINE;
- if (unlikely(what == 0 || what > ARRAY_SIZE(what2act)))
+ if (unlikely(what == 0 || what >= ARRAY_SIZE(what2act)))
ret = trace_seq_printf(s, "Bad pc action %x\n", what);
else {
const bool long_act = !!(trace_flags & TRACE_ITER_VERBOSE);
@@ -1199,7 +1199,7 @@ static enum print_line_t blk_tracer_print_line(struct trace_iterator *iter)
t = (const struct blk_io_trace *)iter->ent;
what = t->action & ((1 << BLK_TC_SHIFT) - 1);
- if (unlikely(what == 0 || what > ARRAY_SIZE(what2act)))
+ if (unlikely(what == 0 || what >= ARRAY_SIZE(what2act)))
ret = trace_seq_printf(&iter->seq, "Bad pc action %x\n", what);
else {
const bool long_act = !!(trace_flags & TRACE_ITER_VERBOSE);