From: Rafael Mendonca rafaelmendsr@gmail.com

Check if fp->rethook succeeded to be allocated. Otherwise, if rethook_alloc() fails, then we end up dereferencing a NULL pointer in rethook_add_node().

Link: https://lore.kernel.org/all/20221025031209.954836-1-rafaelmendsr@gmail.com/

Fixes: 5b0ab78998e3 ("fprobe: Add exit_handler support") Cc: stable@vger.kernel.org Signed-off-by: Rafael Mendonca rafaelmendsr@gmail.com Acked-by: Steven Rostedt (Google) rostedt@goodmis.org Acked-by: Masami Hiramatsu (Google) mhiramat@kernel.org Signed-off-by: Masami Hiramatsu (Google) mhiramat@kernel.org --- kernel/trace/fprobe.c | 2 ++ 1 file changed, 2 insertions(+)

diff --git a/kernel/trace/fprobe.c b/kernel/trace/fprobe.c index aac63ca9c3d1..71614b2a67ff 100644 --- a/kernel/trace/fprobe.c +++ b/kernel/trace/fprobe.c @@ -141,6 +141,8 @@ static int fprobe_init_rethook(struct fprobe *fp, int num) return -E2BIG;

fp->rethook = rethook_alloc((void *)fp, fprobe_exit_handler); + if (!fp->rethook) + return -ENOMEM; for (i = 0; i < size; i++) { struct fprobe_rethook_node *node;