[PATCH bpf] bpf: propagate kvmemdup_bpfptr errors from bpf_prog_verify_signature

[Weixie Cui]

From: Weixie Cui <cuiweixie@xxxxxxxxx>

kvmemdup_bpfptr() returns -EFAULT when the user pointer cannot be
copied, and -ENOMEM on allocation failure. The error path always
returned -ENOMEM, misreporting bad addresses as out-of-memory.

Return PTR_ERR(sig) so user space gets the correct errno.

Signed-off-by: Weixie Cui <cuiweixie@xxxxxxxxx>
---
 kernel/bpf/syscall.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
index 274039e36465..51ade3cde8bb 100644
--- a/kernel/bpf/syscall.c
+++ b/kernel/bpf/syscall.c
@@ -2832,7 +2832,7 @@ static int bpf_prog_verify_signature(struct bpf_prog *prog, union bpf_attr *attr
 	sig = kvmemdup_bpfptr(usig, attr->signature_size);
 	if (IS_ERR(sig)) {
 		bpf_key_put(key);
-		return -ENOMEM;
+		return PTR_ERR(sig);
 	}
 
 	bpf_dynptr_init(&sig_ptr, sig, BPF_DYNPTR_TYPE_LOCAL, 0,
-- 
2.39.5 (Apple Git-154)