From: Miklos Szeredi <mszeredi@suse.cz>
Date: Tue, 13 Dec 2011 10:40:59 +0000 (+0100)
Subject: fuse: llseek fix race
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=73104b6e37f75f822e3dcf016147c322d1f6dad9;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git

fuse: llseek fix race

Fix race between lseek(fd, 0, SEEK_CUR) and read/write.  This was fixed in
generic code by commit 5b6f1eb97d (vfs: lseek(fd, 0, SEEK_CUR) race condition).

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
---

diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 19029e97ca2f..0c84100acd44 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -1567,6 +1567,10 @@ static loff_t fuse_file_llseek(struct file *file, loff_t offset, int origin)
 		offset += i_size_read(inode);
 		break;
 	case SEEK_CUR:
+		if (offset == 0) {
+			retval = file->f_pos;
+			goto exit;
+		}
 		offset += file->f_pos;
 		break;
 	case SEEK_DATA: