[PATCH - nfs-utils] mountd: fix next_mnt handling for "/"

[NeilBrown <neilb@suse.de>]

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If the (exported) path passed to next_mnt() is simply "/", next_mnt()
will not report any children, as none start with "/" followed by
a '/'.
So make a special case for strlen(p)==1.  In that case, return all
children.

This gives correct handling if only "/" is exported.

Signed-off-by: NeilBrown <neilb@suse.de>

diff --git a/utils/mountd/cache.c b/utils/mountd/cache.c
index c23d384d24eb..ac36b6d9f21e 100644
--- a/utils/mountd/cache.c
+++ b/utils/mountd/cache.c
@@ -377,6 +377,7 @@ static char *next_mnt(void **v, char *p)
 	} else
 		f = *v;
 	while ((me = getmntent(f)) != NULL &&
+	       l > 1 &&
 	       (strncmp(me->mnt_dir, p, l) != 0 ||
 		me->mnt_dir[l] != '/'))
 		;

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