linux-kernel - [PATCH] mconsole_proc(): don't mess with file->f

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Date:   Sat, 10 Feb 2018 01:35:16 +0000
From:   Al Viro <viro@...IV.linux.org.uk>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH] mconsole_proc(): don't mess with file->f_pos

mconsole_proc(): don't mess with file->f_pos
    
Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
---
diff --git a/arch/um/drivers/mconsole_kern.c b/arch/um/drivers/mconsole_kern.c
index c4d162a94be9..d5f9a2d1da1b 100644
--- a/arch/um/drivers/mconsole_kern.c
+++ b/arch/um/drivers/mconsole_kern.c
@@ -130,6 +130,7 @@ void mconsole_proc(struct mc_request *req)
 	struct file *file;
 	int first_chunk = 1;
 	char *ptr = req->request.data;
+	loff_t pos = 0;
 
 	ptr += strlen("proc");
 	ptr = skip_spaces(ptr);
@@ -148,7 +149,7 @@ void mconsole_proc(struct mc_request *req)
 	}
 
 	do {
-		len = kernel_read(file, buf, PAGE_SIZE - 1, &file->f_pos);
+		len = kernel_read(file, buf, PAGE_SIZE - 1, &pos);
 		if (len < 0) {
 			mconsole_reply(req, "Read of file failed", 1, 0);
 			goto out_free;