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: v6.1-rc5~592^2
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=3f61631d47f115b83c935d0039f95cb68b0c8ab7;p=platform%2Fkernel%2Flinux-starfive.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: 868941b14441 "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 f130499..f495fdb 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)