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    Subject[PATCH 3.12 026/235] ext4: fix mballoc breakage with 64k block size
    Date
    From: Chandan Rajendra <chandan@linux.vnet.ibm.com>

    3.12-stable review patch. If anyone has any objections, please let me know.

    ===============

    commit 69e43e8cc971a79dd1ee5d4343d8e63f82725123 upstream.

    'border' variable is set to a value of 2 times the block size of the
    underlying filesystem. With 64k block size, the resulting value won't
    fit into a 16-bit variable. Hence this commit changes the data type of
    'border' to 'unsigned int'.

    Fixes: c9de560ded61f
    Signed-off-by: Chandan Rajendra <chandan@linux.vnet.ibm.com>
    Signed-off-by: Theodore Ts'o <tytso@mit.edu>
    Reviewed-by: Andreas Dilger <adilger@dilger.ca>
    Signed-off-by: Jiri Slaby <jslaby@suse.cz>
    ---
    fs/ext4/mballoc.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
    index 96f4c72fbbd2..d775b7b02dd0 100644
    --- a/fs/ext4/mballoc.c
    +++ b/fs/ext4/mballoc.c
    @@ -668,7 +668,7 @@ static void ext4_mb_mark_free_simple(struct super_block *sb,
    ext4_grpblk_t min;
    ext4_grpblk_t max;
    ext4_grpblk_t chunk;
    - unsigned short border;
    + unsigned int border;

    BUG_ON(len > EXT4_CLUSTERS_PER_GROUP(sb));

    --
    2.11.0
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