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    Subject[PATCH AUTOSEL 5.4 34/40] erofs: fix shift-out-of-bounds of blkszbits
    Date
    From: Gao Xiang <hsiangkao@redhat.com>

    [ Upstream commit bde545295b710bdd13a0fcd4b9fddd2383eeeb3a ]

    syzbot generated a crafted bitszbits which can be shifted
    out-of-bounds[1]. So directly print unsupported blkszbits
    instead of blksize.

    [1] https://lore.kernel.org/r/000000000000c72ddd05b9444d2f@google.com

    Link: https://lore.kernel.org/r/20210120013016.14071-1-hsiangkao@aol.com
    Reported-by: syzbot+c68f467cd7c45860e8d4@syzkaller.appspotmail.com
    Reviewed-by: Chao Yu <yuchao0@huawei.com>
    Signed-off-by: Gao Xiang <hsiangkao@redhat.com>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    fs/erofs/super.c | 4 ++--
    1 file changed, 2 insertions(+), 2 deletions(-)

    diff --git a/fs/erofs/super.c b/fs/erofs/super.c
    index 0e369494f2f2c..22e059b4f745c 100644
    --- a/fs/erofs/super.c
    +++ b/fs/erofs/super.c
    @@ -124,8 +124,8 @@ static int erofs_read_superblock(struct super_block *sb)
    blkszbits = dsb->blkszbits;
    /* 9(512 bytes) + LOG_SECTORS_PER_BLOCK == LOG_BLOCK_SIZE */
    if (blkszbits != LOG_BLOCK_SIZE) {
    - erofs_err(sb, "blksize %u isn't supported on this platform",
    - 1 << blkszbits);
    + erofs_err(sb, "blkszbits %u isn't supported on this platform",
    + blkszbits);
    goto out;
    }

    --
    2.27.0
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