From eb08f8eb0673d9c1e62b69ad1b41593e73c40467 Mon Sep 17 00:00:00 2001 From: Li Zefan Date: Tue, 24 Mar 2009 16:05:27 +0800 Subject: [PATCH] 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 Acked-by: Jens Axboe Acked-by: Arnaldo Carvalho de Melo Acked-by: Steven Rostedt Signed-off-by: Ingo Molnar --- kernel/trace/blktrace.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c index a7f7ff5db38b..d43cdac7c754 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);