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fprobe: Check rethook_alloc() return in rethook initialization

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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: 5b0ab78998 ("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>
This commit is contained in:
Rafael Mendonca 2022-10-25 00:12:08 -03:00 committed by Masami Hiramatsu (Google)
parent 4a6f316d68
commit d05ea35e7e
1 changed files with 2 additions and 0 deletions
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2
kernel/trace/fprobe.c
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@ -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;