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--- sys/kern/vfs_syscalls.c.orig
+++ sys/kern/vfs_syscalls.c
@@ -600,6 +600,8 @@
size = count * sizeof(struct statfs);
error = kern_getfsstat(td, &buf, size, &count, UIO_SYSSPACE,
uap->mode);
+ if (buf == NULL)
+ return (EINVAL);
td->td_retval[0] = count;
if (size != 0) {
sp = buf;
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