From 3f61631d47f115b83c935d0039f95cb68b0c8ab7 Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Sun, 14 Aug 2022 15:16:18 -0400
Subject: [PATCH] take care to handle NULL ->proc_lseek()
Easily done now, just by clearing FMODE_LSEEK in ->f_mode
during proc_reg_open() for such entries.
Fixes: 868941b14441 "fs: remove no_llseek"
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
fs/proc/inode.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/fs/proc/inode.c b/fs/proc/inode.c
index f130499ad8432..f495fdb391517 100644
--- a/fs/proc/inode.c
+++ b/fs/proc/inode.c
@@ -494,6 +494,9 @@ static int proc_reg_open(struct inode *inode, struct file *file)
typeof_member(struct proc_ops, proc_release) release;
struct pde_opener *pdeo;
+ if (!pde->proc_ops->proc_lseek)
+ file->f_mode &= ~FMODE_LSEEK;
+
if (pde_is_permanent(pde)) {
open = pde->proc_ops->proc_open;
if (open)
--
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