Commit d05ea35e authored by Rafael Mendonca's avatar Rafael Mendonca Committed by Masami Hiramatsu (Google)
Browse files

fprobe: Check rethook_alloc() return in rethook initialization 

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: 5b0ab789 ("fprobe: Add exit_handler support")
Cc: stable@vger.kernel.org
Signed-off-by: default avatarRafael Mendonca <rafaelmendsr@gmail.com>
Acked-by: default avatarSteven Rostedt (Google) <rostedt@goodmis.org>
Acked-by: default avatarMasami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: default avatarMasami Hiramatsu (Google) <mhiramat@kernel.org>
parent 4a6f316d

kernel/trace/fprobe.c

+2 −0
Original line number Diff line number Diff line
@@ -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;