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    Subject[PATCH v2] ext4: ext4_fill_super shouldn't return 0 on corruption
    At the start of ext4_fill_super, ret is set to -EINVAL, and any failure path
    out of that function returns ret. However, the generic_check_addressable
    clause sets ret = 0 (if it passes), which means that a subsequent failure (e.g.
    a group checksum error) returns 0 even though the mount should fail. This
    causes vfs_kern_mount in turn to think that the mount succeeded, leading to an

    A simple fix is to avoid using ret for the generic_check_addressable check,
    which was last changed in commit 30ca22c70e3ef0a96ff84de69cd7e8561b416cb2.

    v2: Return -EFBIG in the error case, per Eric Sandeen's suggestion.

    Signed-off-by: Darrick J. Wong <>

    fs/ext4/super.c | 6 +++---
    1 files changed, 3 insertions(+), 3 deletions(-)

    diff --git a/fs/ext4/super.c b/fs/ext4/super.c
    index 40131b7..120c034 100644
    --- a/fs/ext4/super.c
    +++ b/fs/ext4/super.c
    @@ -3257,13 +3257,13 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
    * Test whether we have more sectors than will fit in sector_t,
    * and whether the max offset is addressable by the page cache.
    - ret = generic_check_addressable(sb->s_blocksize_bits,
    - ext4_blocks_count(es));
    - if (ret) {
    + if (generic_check_addressable(sb->s_blocksize_bits,
    + ext4_blocks_count(es))) {
    ext4_msg(sb, KERN_ERR, "filesystem"
    " too large to mount safely on this system");
    if (sizeof(sector_t) < 8)
    ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
    + ret = -EFBIG;
    goto failed_mount;

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      Last update: 2010-11-16 00:07    [W:0.020 / U:18.876 seconds]
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