diff options
| author | Steven Rostedt (VMware) <rostedt@goodmis.org> | 2017-12-26 20:07:34 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-01-02 20:35:07 +0100 |
| commit | 5dc4cd2688e39b0286e9a4b815c9bf5e71b5a685 (patch) | |
| tree | 89bb33565708120dc06ebec3034f1eb71ff6099c | |
| parent | 6edea15d120c6e18b6383969e35d6a9683b31d2c (diff) | |
tracing: Fix possible double free on failure of allocating trace buffer
commit 4397f04575c44e1440ec2e49b6302785c95fd2f8 upstream.
Jing Xia and Chunyan Zhang reported that on failing to allocate part of the
tracing buffer, memory is freed, but the pointers that point to them are not
initialized back to NULL, and later paths may try to free the freed memory
again. Jing and Chunyan fixed one of the locations that does this, but
missed a spot.
Link: http://lkml.kernel.org/r/20171226071253.8968-1-chunyan.zhang@spreadtrum.com
Fixes: 737223fbca3b1 ("tracing: Consolidate buffer allocation code")
Reported-by: Jing Xia <jing.xia@spreadtrum.com>
Reported-by: Chunyan Zhang <chunyan.zhang@spreadtrum.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | kernel/trace/trace.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index a0ad5a2ad656..bbc117d73d19 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -6955,6 +6955,7 @@ allocate_trace_buffer(struct trace_array *tr, struct trace_buffer *buf, int size buf->data = alloc_percpu(struct trace_array_cpu); if (!buf->data) { ring_buffer_free(buf->buffer); + buf->buffer = NULL; return -ENOMEM; } |