[PATCH] autofs: fix sbi->pipe file reference leak in autofs_kill_sb()

[Hui Peng <benquike@gmail.com>]

When autofs_fill_super() fails before clearing AUTOFS_SBI_CATATONIC (for
example, when find_get_pid() fails on an invalid pgrp mount option, or
when an fs_context is closed before mounting), deactivate_locked_super()
invokes autofs_kill_sb() -> autofs_catatonic_mode(sbi).

Because AUTOFS_SBI_CATATONIC is still set in sbi->flags,
autofs_catatonic_mode() returns early without calling fput(sbi->pipe),
permanently leaking the pipe struct file reference.

Explicitly release sbi->pipe in autofs_kill_sb() if it is still non-NULL
after autofs_catatonic_mode().

Fixes: ebc921ca9b92 ("autofs: copy autofs4 to autofs")
Assisted-by: LLM
Signed-off-by: Hui Peng <benquike@gmail.com>
---
diff --git a/fs/autofs/inode.c b/fs/autofs/inode.c
--- a/fs/autofs/inode.c
+++ b/fs/autofs/inode.c
@@ -51,6 +51,10 @@ void autofs_kill_sb(struct super_block *sb)
 	if (sbi) {
 		/* Free wait queues, close pipe */
 		autofs_catatonic_mode(sbi);
+		if (sbi->pipe) {
+			fput(sbi->pipe);
+			sbi->pipe = NULL;
+		}
 		put_pid(sbi->oz_pgrp);
 	}
 
-- 
2.43.0