[PATCH 5.15 047/371] ksmbd: fix NULL pointer dereference in smb2_get_info_filesystem()

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From: Namjae Jeon <linkinjeon@xxxxxxxxxx>

commit 3ac00a2ab69b34189942afa9e862d5170cdcb018 upstream.

If share is , share->path is NULL and it cause NULL pointer
dereference issue.

Cc: stable@xxxxxxxxxxxxxxx
Reported-by: zdi-disclosures@xxxxxxxxxxxxxx # ZDI-CAN-20479
Signed-off-by: Namjae Jeon <linkinjeon@xxxxxxxxxx>
Signed-off-by: Steve French <stfrench@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 fs/ksmbd/smb2pdu.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/fs/ksmbd/smb2pdu.c
+++ b/fs/ksmbd/smb2pdu.c
@@ -4879,6 +4879,9 @@ static int smb2_get_info_filesystem(stru
 	int rc = 0, len;
 	int fs_infoclass_size = 0;
 
+	if (!share->path)
+		return -EIO;
+
 	rc = kern_path(share->path, LOOKUP_NO_SYMLINKS, &path);
 	if (rc) {
 		pr_err("cannot create vfs path\n");





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