tracing: Fix in out of bounds write in get_trace_buf
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Message ID 20201029152404.3534-1-hqjagain@gmail.com
State New
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Series
  • tracing: Fix in out of bounds write in get_trace_buf
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Commit Message

Qiujun Huang Oct. 29, 2020, 3:24 p.m. UTC
The boundary condition should be 3 as we access
buffer[buffer->nesting][0].

Fixes: e2ace001176dc ("tracing: Choose static tp_printk buffer by explicit nesting count")
Signed-off-by: Qiujun Huang <hqjagain@gmail.com>
---
 kernel/trace/trace.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Patch
diff mbox series

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 528971714fc6..196a4b7de48a 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -3125,7 +3125,7 @@  static char *get_trace_buf(void)
 {
 	struct trace_buffer_struct *buffer = this_cpu_ptr(trace_percpu_buffer);
 
-	if (!buffer || buffer->nesting >= 4)
+	if (!buffer || buffer->nesting >= 3)
 		return NULL;
 
 	buffer->nesting++;