diff options
| author | Vincent Donnefort <vdonnefort@google.com> | 2026-07-09 17:00:15 +0100 |
|---|---|---|
| committer | Steven Rostedt <rostedt@goodmis.org> | 2026-07-10 14:04:26 -0400 |
| commit | ec082d0b978b5fb4c11205ccce63587ac94c74e1 (patch) | |
| tree | 13311750e22d84e82464f58e72755888b1bc7af3 /kernel | |
| parent | 42e74d8f21ce448fe12ba3dd59db817b3e977f49 (diff) | |
tracing/remotes: Fix leak in trace_remote_alloc_buffer() error path
If page allocation fails in trace_remote_alloc_buffer(), desc->nr_cpus
is not yet incremented for the current CPU. As a consequence, on error,
half-allocated rb_desc will not be freed in trace_remote_free_buffer().
Increment desc->nr_cpus as soon as the first allocation for the current
CPU has succeeded.
Link: https://patch.msgid.link/20260709160017.1729517-2-vdonnefort@google.com
Fixes: 96e43537af54 ("tracing: Introduce trace remotes")
Reported-by: Sashiko <sashiko-bot@kernel.org>
Signed-off-by: Vincent Donnefort <vdonnefort@google.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/trace/trace_remote.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/kernel/trace/trace_remote.c b/kernel/trace/trace_remote.c index 2a6cc000ec98..d48042239d58 100644 --- a/kernel/trace/trace_remote.c +++ b/kernel/trace/trace_remote.c @@ -1006,6 +1006,8 @@ int trace_remote_alloc_buffer(struct trace_buffer_desc *desc, size_t desc_size, if (!rb_desc->meta_va) goto err; + desc->nr_cpus++; + for (id = 0; id < nr_pages; id++) { rb_desc->page_va[id] = (unsigned long)__get_free_page(GFP_KERNEL); if (!rb_desc->page_va[id]) @@ -1013,7 +1015,6 @@ int trace_remote_alloc_buffer(struct trace_buffer_desc *desc, size_t desc_size, rb_desc->nr_page_va++; } - desc->nr_cpus++; desc->struct_len += offsetof(struct ring_buffer_desc, page_va); desc->struct_len += struct_size(rb_desc, page_va, rb_desc->nr_page_va); rb_desc = __next_ring_buffer_desc(rb_desc); |