[PATCH bpf-next v2 04/11] bpf: Hold RCU read lock in bpf_prog_ksym_find

[Kumar Kartikeya Dwivedi <memxor@gmail.com>]

The bpf_ksym_find must be called with RCU read protection, wrap the call
to bpf_ksym_find in bpf_prog_ksym_find with RCU read lock so that
callers do not have to care about holding it specifically.

Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
---
 kernel/bpf/core.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/kernel/bpf/core.c b/kernel/bpf/core.c
index 8d381ca9f2fa..959538f91c60 100644
--- a/kernel/bpf/core.c
+++ b/kernel/bpf/core.c
@@ -782,7 +782,11 @@ bool is_bpf_text_address(unsigned long addr)
 
 struct bpf_prog *bpf_prog_ksym_find(unsigned long addr)
 {
-	struct bpf_ksym *ksym = bpf_ksym_find(addr);
+	struct bpf_ksym *ksym;
+
+	rcu_read_lock();
+	ksym = bpf_ksym_find(addr);
+	rcu_read_unlock();
 
 	return ksym && ksym->prog ?
 	       container_of(ksym, struct bpf_prog_aux, ksym)->prog :
-- 
2.47.1