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50 lines
2.0 KiB
Diff
50 lines
2.0 KiB
Diff
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From: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
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Subject: [PATCH v2 1/1] f2fs: fix validation of the block count in
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sanity_check_raw_super
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Date: Sat, 22 Dec 2018 11:22:26 +0100
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Message-Id: <20181222102226.10050-2-martin.blumenstingl@googlemail.com>
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Treat "block_count" from struct f2fs_super_block as 64-bit little endian
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value in sanity_check_raw_super() because struct f2fs_super_block
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declares "block_count" as "__le64".
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This fixes a bug where the superblock validation fails on big endian
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devices with the following error:
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F2FS-fs (sda1): Wrong segment_count / block_count (61439 > 0)
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F2FS-fs (sda1): Can't find valid F2FS filesystem in 1th superblock
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F2FS-fs (sda1): Wrong segment_count / block_count (61439 > 0)
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F2FS-fs (sda1): Can't find valid F2FS filesystem in 2th superblock
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As result of this the partition cannot be mounted.
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With this patch applied the superblock validation works fine and the
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partition can be mounted again:
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F2FS-fs (sda1): Mounted with checkpoint version = 7c84
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My little endian x86-64 hardware was able to mount the partition without
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this fix.
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To confirm that mounting f2fs filesystems works on big endian machines
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again I tested this on a 32-bit MIPS big endian (lantiq) device.
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Fixes: 0cfe75c5b01199 ("f2fs: enhance sanity_check_raw_super() to avoid potential overflows")
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Cc: stable@vger.kernel.org
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Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
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Reviewed-by: Chao Yu <yuchao0@huawei.com>
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---
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--- a/fs/f2fs/super.c
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+++ b/fs/f2fs/super.c
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@@ -2267,10 +2267,10 @@ static int sanity_check_raw_super(struct
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return 1;
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}
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- if (segment_count > (le32_to_cpu(raw_super->block_count) >> 9)) {
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+ if (segment_count > (le64_to_cpu(raw_super->block_count) >> 9)) {
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f2fs_msg(sb, KERN_INFO,
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- "Wrong segment_count / block_count (%u > %u)",
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- segment_count, le32_to_cpu(raw_super->block_count));
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+ "Wrong segment_count / block_count (%u > %llu)",
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+ segment_count, le64_to_cpu(raw_super->block_count));
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return 1;
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}
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