From: Rafael Mendonca rafaelmendsr@gmail.com
commit d05ea35e7eea14d32f29fd688d3daeb9089de1a5 upstream.
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 Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- kernel/trace/fprobe.c | 2 ++ 1 file changed, 2 insertions(+)
--- a/kernel/trace/fprobe.c +++ b/kernel/trace/fprobe.c @@ -141,6 +141,8 @@ static int fprobe_init_rethook(struct fp 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;