Messages in this thread Patch in this message | | | From | Qiujun Huang <> | Subject | [PATCH] tracing: Fix in out of bounds write in get_trace_buf | Date | Thu, 29 Oct 2020 23:24:04 +0800 |
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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(-)
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++; -- 2.17.1
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