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ceph: fix directories inode i_blkbits initialization 

When filling an inode with info from the MDS, i_blkbits is being
initialized using fl_stripe_unit, which contains the stripe unit in
bytes.  Unfortunately, this doesn't make sense for directories as they
have fl_stripe_unit set to '0'.  This means that i_blkbits will be set
to 0xff, causing an UBSAN undefined behaviour in i_blocksize():

  UBSAN: Undefined behaviour in ./include/linux/fs.h:731:12
  shift exponent 255 is too large for 32-bit type 'int'

Fix this by initializing i_blkbits to CEPH_BLOCK_SHIFT if fl_stripe_unit
is zero.

Signed-off-by: Luis Henriques <lhenriques@suse.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Luis Henriques 2019-07-23 16:50:20 +01:00 committed by Ilya Dryomov
parent 4d856f72c1
commit 750670341a
1 changed files with 6 additions and 1 deletions
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7
fs/ceph/inode.c
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@ -801,7 +801,12 @@ static int fill_inode(struct inode *inode, struct page *locked_page,
/* update inode */
inode->i_rdev = le32_to_cpu(info->rdev);
inode->i_blkbits = fls(le32_to_cpu(info->layout.fl_stripe_unit)) - 1;
/* directories have fl_stripe_unit set to zero */
if (le32_to_cpu(info->layout.fl_stripe_unit))
inode->i_blkbits =
fls(le32_to_cpu(info->layout.fl_stripe_unit)) - 1;
else
inode->i_blkbits = CEPH_BLOCK_SHIFT;
__ceph_update_quota(ci, iinfo->max_bytes, iinfo->max_files);