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54 lines
1.7 KiB
Diff
54 lines
1.7 KiB
Diff
From b9dd46188edc2f0d1f37328637860bb65a771124 Mon Sep 17 00:00:00 2001
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From: Jin Qian <jinqian@google.com>
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Date: Tue, 25 Apr 2017 16:28:48 -0700
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Subject: f2fs: sanity check segment count
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F2FS uses 4 bytes to represent block address. As a result, supported
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size of disk is 16 TB and it equals to 16 * 1024 * 1024 / 2 segments.
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Signed-off-by: Jin Qian <jinqian@google.com>
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Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
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---
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fs/f2fs/super.c | 7 +++++++
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include/linux/f2fs_fs.h | 6 ++++++
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2 files changed, 13 insertions(+)
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diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
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index 97c07a5..4cd3bee 100644
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--- a/fs/f2fs/super.c
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+++ b/fs/f2fs/super.c
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@@ -1494,6 +1494,13 @@ static int sanity_check_raw_super(struct f2fs_sb_info *sbi,
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return 1;
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}
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+ if (le32_to_cpu(raw_super->segment_count) > F2FS_MAX_SEGMENT) {
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+ f2fs_msg(sb, KERN_INFO,
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+ "Invalid segment count (%u)",
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+ le32_to_cpu(raw_super->segment_count));
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+ return 1;
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+ }
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+
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/* check CP/SIT/NAT/SSA/MAIN_AREA area boundary */
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if (sanity_check_area_boundary(sbi, bh))
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return 1;
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diff --git a/include/linux/f2fs_fs.h b/include/linux/f2fs_fs.h
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index 639cbdf..093549e 100644
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--- a/include/linux/f2fs_fs.h
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+++ b/include/linux/f2fs_fs.h
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@@ -302,6 +302,12 @@ struct f2fs_nat_block {
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#define SIT_ENTRY_PER_BLOCK (PAGE_SIZE / sizeof(struct f2fs_sit_entry))
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/*
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+ * F2FS uses 4 bytes to represent block address. As a result, supported size of
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+ * disk is 16 TB and it equals to 16 * 1024 * 1024 / 2 segments.
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+ */
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+#define F2FS_MAX_SEGMENT ((16 * 1024 * 1024) / 2)
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+
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+/*
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* Note that f2fs_sit_entry->vblocks has the following bit-field information.
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* [15:10] : allocation type such as CURSEG_XXXX_TYPE
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* [9:0] : valid block count
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--
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cgit v1.1
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