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ftrace: Free ftrace hashes after they are replaced in the subops code

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The subops processing creates new hashes when adding and removing subops.
There were some places that the old hashes that were replaced were not
freed and this caused some memory leaks.

Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Link: https://lore.kernel.org/20250417135939.245b128d@gandalf.local.home
Fixes: 0ae6b8ce20 ("ftrace: Fix accounting of subop hashes")
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt 2025-04-17 13:59:39 -04:00 committed by Steven Rostedt (Google)
parent 08275e59a7
commit c45c585dde
1 changed files with 7 additions and 1 deletions
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8
kernel/trace/ftrace.c
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@ -3609,6 +3609,9 @@ static int rebuild_hashes(struct ftrace_hash **filter_hash, struct ftrace_hash *
}
}
free_ftrace_hash(temp_hash.filter_hash);
free_ftrace_hash(temp_hash.notrace_hash);
temp_hash.filter_hash = *filter_hash;
temp_hash.notrace_hash = *notrace_hash;
}
@ -3703,8 +3706,11 @@ static int ftrace_hash_move_and_update_subops(struct ftrace_ops *subops,
}
ret = rebuild_hashes(&filter_hash, &notrace_hash, ops);
if (!ret)
if (!ret) {
ret = ftrace_update_ops(ops, filter_hash, notrace_hash);
free_ftrace_hash(filter_hash);
free_ftrace_hash(notrace_hash);
}
if (ret) {
/* Put back the original hash */