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57 lines
1.9 KiB
Diff
57 lines
1.9 KiB
Diff
From b69c3038bb41fa18c038ed93cf52123fda7f8c69 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: [PATCH] UPSTREAM: f2fs: sanity check segment count
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commit b9dd46188edc2f0d1f37328637860bb65a771124 upstream.
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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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Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Bug: 36815012
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Change-Id: I30ea36df066bc07e32e767336b7cae12063fe415
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---
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fs/f2fs/super.c | 8 ++++++++
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include/linux/f2fs_fs.h | 6 ++++++
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2 files changed, 14 insertions(+)
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diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
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index 03ab8b830940b..77b2cd5ddd569 100644
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--- a/fs/f2fs/super.c
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+++ b/fs/f2fs/super.c
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@@ -434,6 +434,14 @@ static int sanity_check_raw_super(struct super_block *sb,
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f2fs_msg(sb, KERN_INFO, "Invalid log sectors per block");
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return 1;
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}
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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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return 0;
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}
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diff --git a/include/linux/f2fs_fs.h b/include/linux/f2fs_fs.h
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index df6fab82f87e7..fdb6cb9fe0bb3 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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@@ -235,6 +235,12 @@ struct f2fs_nat_block {
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#define SIT_ENTRY_PER_BLOCK (PAGE_CACHE_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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