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    Subject[PATCH 4.4 58/60] f2fs: sanity check segment count
    Date
    4.4-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Jin Qian <jinqian@google.com>

    commit b9dd46188edc2f0d1f37328637860bb65a771124 upstream.

    F2FS uses 4 bytes to represent block address. As a result, supported
    size of disk is 16 TB and it equals to 16 * 1024 * 1024 / 2 segments.

    Signed-off-by: Jin Qian <jinqian@google.com>
    Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    fs/f2fs/super.c | 7 +++++++
    include/linux/f2fs_fs.h | 6 ++++++
    2 files changed, 13 insertions(+)

    --- a/fs/f2fs/super.c
    +++ b/fs/f2fs/super.c
    @@ -1059,6 +1059,13 @@ static int sanity_check_raw_super(struct
    return 1;
    }

    + if (le32_to_cpu(raw_super->segment_count) > F2FS_MAX_SEGMENT) {
    + f2fs_msg(sb, KERN_INFO,
    + "Invalid segment count (%u)",
    + le32_to_cpu(raw_super->segment_count));
    + return 1;
    + }
    +
    /* check CP/SIT/NAT/SSA/MAIN_AREA area boundary */
    if (sanity_check_area_boundary(sb, raw_super))
    return 1;
    --- a/include/linux/f2fs_fs.h
    +++ b/include/linux/f2fs_fs.h
    @@ -284,6 +284,12 @@ struct f2fs_nat_block {
    #define SIT_ENTRY_PER_BLOCK (PAGE_CACHE_SIZE / sizeof(struct f2fs_sit_entry))

    /*
    + * F2FS uses 4 bytes to represent block address. As a result, supported size of
    + * disk is 16 TB and it equals to 16 * 1024 * 1024 / 2 segments.
    + */
    +#define F2FS_MAX_SEGMENT ((16 * 1024 * 1024) / 2)
    +
    +/*
    * Note that f2fs_sit_entry->vblocks has the following bit-field information.
    * [15:10] : allocation type such as CURSEG_XXXX_TYPE
    * [9:0] : valid block count

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