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rethook: fix a potential memleak in rethook_alloc() 

commit 0a1ebe35cb upstream.

In rethook_alloc(), the variable rh is not freed or passed out
if handler is NULL, which could lead to a memleak, fix it.

Link: https://lore.kernel.org/all/20221110104438.88099-1-yiyang13@huawei.com/
[Masami: Add "rethook:" tag to the title.]

Fixes: 54ecbe6f1e ("rethook: Add a generic return hook")
Cc: stable@vger.kernel.org
Signed-off-by: Yi Yang <yiyang13@huawei.com>
Acke-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Yi Yang 2022-11-18 10:15:34 +09:00 committed by Greg Kroah-Hartman
parent 510c12f936
commit cbc5d1f9a8
1 changed files with 3 additions and 1 deletions
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4
kernel/trace/rethook.c
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@ -83,8 +83,10 @@ struct rethook *rethook_alloc(void *data, rethook_handler_t handler)
{
struct rethook *rh = kzalloc(sizeof(struct rethook), GFP_KERNEL);
if (!rh || !handler)
if (!rh || !handler) {
kfree(rh);
return NULL;
}
rh->data = data;
rh->handler = handler;