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diff --git a/sys/ufs/ffs/ffs_alloc.c b/sys/ufs/ffs/ffs_alloc.c
--- a/sys/ufs/ffs/ffs_alloc.c
+++ b/sys/ufs/ffs/ffs_alloc.c
@@ -3211,9 +3211,9 @@
cap_rights_t rights;
int filetype, error;
- if (req->newlen > sizeof cmd)
+ if (req->newptr == NULL || req->newlen > sizeof(cmd))
return (EBADRPC);
- if ((error = SYSCTL_IN(req, &cmd, sizeof cmd)) != 0)
+ if ((error = SYSCTL_IN(req, &cmd, sizeof(cmd))) != 0)
return (error);
if (cmd.version != FFS_CMD_VERSION)
return (ERPCMISMATCH);

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