From d69a900de346b6da958ceb3711d3becd55a7ae71 Mon Sep 17 00:00:00 2001
From: Jin Qian <jinqian@google.com>
Date: Mon, 24 Apr 2017 18:20:52 -0700
Subject: [PATCH] BACKPORT: f2fs: sanity check log_blocks_per_seg
f2fs currently only supports 4KB block size and 2MB segment size.
Sanity check log_blocks_per_seg == 9, i.e. 2MB/4KB = (1 << 9)
Partially
(cherry-picked from commit 9a59b62fd88196844cee5fff851bee2cfd7afb6e)
f2fs: do more integrity verification for superblock
Do more sanity check for superblock during ->mount.
Signed-off-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Bug: 36817013
Change-Id: I0be52e54fba82083068337ceb9f7ad985a87319f
Signed-off-by: Jin Qian <jinqian@google.com>
---
fs/f2fs/super.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 3a65e0132352..98a77b0a365d 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -947,6 +947,14 @@ static int sanity_check_raw_super(struct super_block *sb,
return 1;
}
+ /* check log blocks per segment */
+ if (le32_to_cpu(raw_super->log_blocks_per_seg) != 9) {
+ f2fs_msg(sb, KERN_INFO,
+ "Invalid log blocks per segment (%u)\n",
+ le32_to_cpu(raw_super->log_blocks_per_seg));
+ return 1;
+ }
+
/* Currently, support 512/1024/2048/4096 bytes sector size */
if (le32_to_cpu(raw_super->log_sectorsize) >
F2FS_MAX_LOG_SECTOR_SIZE ||
--
2.34.1