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-rw-r--r--toys/posix/du.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/toys/posix/du.c b/toys/posix/du.c
index 22a26d3a..00a7f68a 100644
--- a/toys/posix/du.c
+++ b/toys/posix/du.c
@@ -110,6 +110,15 @@ static int do_du(struct dirtree *node)
if ((toys.optflags & FLAG_x) && (TT.st_dev != node->st.st_dev))
return 0;
+ // Don't loop endlessly on recursive directory symlink
+ if (toys.optflags & FLAG_L) {
+ struct dirtree *try = node;
+
+ while ((try = try->parent))
+ if (node->st.st_dev==try->st.st_dev && node->st.st_ino==try->st.st_ino)
+ return 0;
+ }
+
// Don't count hard links twice
if (!(toys.optflags & FLAG_l) && !node->again)
if (seen_inode(&TT.inodes, &node->st)) return 0;