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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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ftrace: Fix direct_functions leak in update_ftrace_direct_del

Alexei reported memory leak in update_ftrace_direct_del.
We miss cleanup of the replaced direct_functions in the
success path in update_ftrace_direct_del, adding that.

Fixes: 8d2c1233f371 ("ftrace: Add update_ftrace_direct_del function")
Reported-by: Alexei Starovoitov <alexei.starovoitov@gmail.com>
Closes: https://lore.kernel.org/bpf/aX_BxG5EJTJdCMT9@krava/T/#m7c13f5a95f862ed7ab78e905fbb678d635306a0c
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Acked-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Link: https://lore.kernel.org/r/20260202075849.1684369-1-jolsa@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

authored by

Jiri Olsa and committed by
Alexei Starovoitov 6b95cc56 4bebb991

+1
+1
kernel/trace/ftrace.c
··· 6537 6537 /* free the new_direct_functions */ 6538 6538 old_direct_functions = new_direct_functions; 6539 6539 } else { 6540 + old_direct_functions = direct_functions; 6540 6541 rcu_assign_pointer(direct_functions, new_direct_functions); 6541 6542 } 6542 6543