1 files changed, 5 insertions, 3 deletions

diff --git a/kernel/trace/trace_stack.c b/kernel/trace/trace_stack.c
index 2b0d1ee3241c..eec648a0d673 100644
--- a/kernel/trace/trace_stack.c
+++ b/kernel/trace/trace_stack.c
@@ -286,7 +286,7 @@ __next(struct seq_file *m, loff_t *pos)
 {
         long n = *pos - 1;
 
-        if (n > stack_trace_max.nr_entries || stack_dump_trace[n] == ULONG_MAX)
+        if (n >= stack_trace_max.nr_entries || stack_dump_trace[n] == ULONG_MAX)
                 return NULL;
 
         m->private = (void *)n;
@@ -448,8 +448,10 @@ static char stack_trace_filter_buf[COMMAND_LINE_SIZE+1] __initdata;
 
 static __init int enable_stacktrace(char *str)
 {
-        if (strncmp(str, "_filter=", 8) == 0)
-                strncpy(stack_trace_filter_buf, str+8, COMMAND_LINE_SIZE);
+        int len;
+
+        if ((len = str_has_prefix(str, "_filter=")))
+                strncpy(stack_trace_filter_buf, str + len, COMMAND_LINE_SIZE);
 
         stack_tracer_enabled = 1;
         last_stack_tracer_enabled = 1;