[43/54] tracing: Fix a potential NULL dereference
diff mbox series

Message ID TY1PR01MB1692D76335794C480960A11896090@TY1PR01MB1692.jpnprd01.prod.outlook.com
State New
Headers show
Series
  • [01/54] tracing: Remove redundant unread variable ret
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Commit Message

Motai.Hirotaka@aj.MitsubishiElectric.co.jp Aug. 29, 2018, 12:17 p.m. UTC
We forgot to set the error code on this path so we return ERR_PTR(0)
which is NULL.  It results in a NULL dereference in the caller.

Link: http://lkml.kernel.org/r/20180323113735.GC28518@mwanda

Fixes: 100719dcef44 ("tracing: Add simple expression support to hist triggers")
Acked-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
(cherry picked from commit 5e4cf2bf6d1c198a90ccc0df5ffd8e0d4ea36b48)
Signed-off-by: Hirotaka MOTAI <Motai.Hirotaka@aj.MitsubishiElectric.co.jp>
---
 kernel/trace/trace_events_hist.c | 1 +
 1 file changed, 1 insertion(+)

Patch
diff mbox series

diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index 4f027642..a02bc09d 100644
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -2771,16 +2771,17 @@  static struct hist_field *parse_expr(struct hist_trigger_data *hist_data,
 	switch (field_op) {
 	case FIELD_OP_MINUS:
 		expr->fn = hist_field_minus;
 		break;
 	case FIELD_OP_PLUS:
 		expr->fn = hist_field_plus;
 		break;
 	default:
+		ret = -EINVAL;
 		goto free;
 	}
 
 	return expr;
  free:
 	destroy_hist_field(operand1, 0);
 	destroy_hist_field(operand2, 0);
 	destroy_hist_field(expr, 0);