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Subject[PATCH] fprobe: Check rethook_alloc() return in rethook initialization
Date
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().

Fixes: 5b0ab78998e3 ("fprobe: Add exit_handler support")
Signed-off-by: Rafael Mendonca <rafaelmendsr@gmail.com>
---
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;

--
2.34.1
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