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However, its return value was not checked. In case of a failed resize this could lead next snapshot being incomplete. Add resize_buffer_duplicate_size() result check and return error if resize fails. Compile tested only. Found by Linux Verification Center (linuxtesting.org) with SVACE. Fixes: 180e4e390978 ("tracing: Add snapshot refcount") Signed-off-by: Dmitry Kandybka --- kernel/trace/trace_snapshot.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/kernel/trace/trace_snapshot.c b/kernel/trace/trace_snapshot.c index 07b43c9863a2..4731ef7325a5 100644 --- a/kernel/trace/trace_snapshot.c +++ b/kernel/trace/trace_snapshot.c @@ -675,9 +675,12 @@ tracing_snapshot_write(struct file *filp, const char __user *ubuf, size_t cnt, if (iter->cpu_file != RING_BUFFER_ALL_CPUS) return -EINVAL; #endif - if (tr->allocated_snapshot) + if (tr->allocated_snapshot) { ret = resize_buffer_duplicate_size(&tr->snapshot_buffer, &tr->array_buffer, iter->cpu_file); + if (ret < 0) + return ret; + } ret = tracing_arm_snapshot_locked(tr); if (ret) -- 2.54.0