MOUNT: when processing the mount response, check status before dereferencing data...

If status is non-zero in the mount callback, then the datapointer might be NULL
so we should not dereference it into an exports pointer before we have checked the status.

This would otherwise cause crashes.

diff --git a/lib/libnfs-sync.c b/lib/libnfs-sync.c
index 737808e429147180a24aa458aa9f1719a036562a..82578f1e9a07fbfb39798ad88986065e9ebcf3cd 100644 (file)
--- a/lib/libnfs-sync.c
+++ b/lib/libnfs-sync.c
@@ -1147,7 +1147,7 @@ int nfs_link(struct nfs_context *nfs, const char *oldpath, const char *newpath)
 void mount_getexports_cb(struct rpc_context *mount_context, int status, void *data, void *private_data)
 {
        struct sync_cb_data *cb_data = private_data;
-       exports export = *(exports *)data;
+       exports export;
 
        cb_data->is_finished = 1;
        cb_data->status = status;
@@ -1158,6 +1158,7 @@ void mount_getexports_cb(struct rpc_context *mount_context, int status, void *da
                return;
        }
 
+       export = *(exports *)data;
        while (export != NULL) {
                exports new_export;