From: Al Viro <viro@zeniv.linux.org.uk>
Date: Sun, 14 Aug 2022 19:16:18 +0000 (-0400)
Subject: take care to handle NULL ->proc_lseek()
X-Git-Tag: baikal/mips/sdk6.1~5016^2
X-Git-Url: https://git.baikalelectronics.ru/?a=commitdiff_plain;h=445ba17cb8e2be93e7aac4703784170da7029c6e;p=kernel.git

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: b7e0530b858d "fs: remove no_llseek"
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---

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)