Re: [PATCH 4/4] xfs_repair: fix left-shift overflows

[Brian Foster <bfoster@redhat.com>]

On Thu, Oct 08, 2015 at 07:27:21PM -0500, Eric Sandeen wrote:
> pmask in struct parent_list is a __uint64_t, but in some places
> we populated it with "1LL << shift" where shift could be up
> to 63; this really needs to be a 1ULL type for this to be correct.
> 
> Also spotted by libubsan...
> 
> The code in prefetch.c has another issue with large fs blocks
> (32 or 64k) because it shifts by up to 128 bits, but that's left
> for later...
> 
> Signed-off-by: Eric Sandeen <sandeen@redhat.com>
> ---

Reviewed-by: Brian Foster <bfoster@redhat.com>

>  repair/incore_ino.c |   14 +++++++-------
>  repair/prefetch.c   |    2 +-
>  2 files changed, 8 insertions(+), 8 deletions(-)
> 
> diff --git a/repair/incore_ino.c b/repair/incore_ino.c
> index 32d7678..1898257 100644
> --- a/repair/incore_ino.c
> +++ b/repair/incore_ino.c
> @@ -625,7 +625,7 @@ set_inode_parent(
>  		else
>  			irec->ino_un.plist = ptbl;
>  
> -		ptbl->pmask = 1LL << offset;
> +		ptbl->pmask = 1ULL << offset;
>  		ptbl->pentries = (xfs_ino_t*)memalign(sizeof(xfs_ino_t),
>  							sizeof(xfs_ino_t));
>  		if (!ptbl->pentries)
> @@ -638,8 +638,8 @@ set_inode_parent(
>  		return;
>  	}
>  
> -	if (ptbl->pmask & (1LL << offset))  {
> -		bitmask = 1LL;
> +	if (ptbl->pmask & (1ULL << offset))  {
> +		bitmask = 1ULL;
>  		target = 0;
>  
>  		for (i = 0; i < offset; i++)  {
> @@ -655,7 +655,7 @@ set_inode_parent(
>  		return;
>  	}
>  
> -	bitmask = 1LL;
> +	bitmask = 1ULL;
>  	cnt = target = 0;
>  
>  	for (i = 0; i < XFS_INODES_PER_CHUNK; i++)  {
> @@ -691,7 +691,7 @@ set_inode_parent(
>  	ptbl->cnt++;
>  #endif
>  	ptbl->pentries[target] = parent;
> -	ptbl->pmask |= (1LL << offset);
> +	ptbl->pmask |= (1ULL << offset);
>  }
>  
>  xfs_ino_t
> @@ -707,8 +707,8 @@ get_inode_parent(ino_tree_node_t *irec, int offset)
>  	else
>  		ptbl = irec->ino_un.plist;
>  
> -	if (ptbl->pmask & (1LL << offset))  {
> -		bitmask = 1LL;
> +	if (ptbl->pmask & (1ULL << offset))  {
> +		bitmask = 1ULL;
>  		target = 0;
>  
>  		for (i = 0; i < offset; i++)  {
> diff --git a/repair/prefetch.c b/repair/prefetch.c
> index 52238ca..b11dcb3 100644
> --- a/repair/prefetch.c
> +++ b/repair/prefetch.c
> @@ -762,7 +762,7 @@ pf_queuing_worker(
>  			 * sparse state in cluster sized chunks as cluster size
>  			 * is the min. granularity of sparse irec regions.
>  			 */
> -			if ((sparse & ((1 << inodes_per_cluster) - 1)) == 0)
> +			if ((sparse & ((1ULL << inodes_per_cluster) - 1)) == 0)
>  				pf_queue_io(args, &map, 1,
>  					    (cur_irec->ino_isa_dir != 0) ?
>  					     B_DIR_INODE : B_INODE);
> -- 
> 1.7.1
> 
> _______________________________________________
> xfs mailing list
> xfs@oss.sgi.com
> http://oss.sgi.com/mailman/listinfo/xfs

_______________________________________________
xfs mailing list
xfs@oss.sgi.com
http://oss.sgi.com/mailman/listinfo/xfs