From: Dave Chinner <david@fromorbit.com>
To: Vivek Trivedi <t.vivek@samsung.com>
Cc: a.sahrawat@samsung.com, pankaj.m@samsung.com, xfs@oss.sgi.com
Subject: Re: [PATCH 03/11] xfsprogs: mkfs: fix unintentional integer overflow
Date: Thu, 3 Dec 2015 16:54:11 +1100 [thread overview]
Message-ID: <20151203055410.GT26718@dastard> (raw)
In-Reply-To: <1449055167-19936-4-git-send-email-t.vivek@samsung.com>
On Wed, Dec 02, 2015 at 04:49:19PM +0530, Vivek Trivedi wrote:
> Fix unintentional integer overflow in mkfs.
> Reported by coverity.
>
> Signed-off-by: Vivek Trivedi <t.vivek@samsung.com>
> ---
> mkfs/xfs_mkfs.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/mkfs/xfs_mkfs.c b/mkfs/xfs_mkfs.c
> index 7cba41a..e540c48 100644
> --- a/mkfs/xfs_mkfs.c
> +++ b/mkfs/xfs_mkfs.c
> @@ -2033,7 +2033,7 @@ _("warning: sparse inodes not supported without CRC support, disabled.\n"));
> /* check that rswidth is a multiple of fs blocksize */
> if (!norsflag && rswidth && !(BBTOB(rswidth) % blocksize)) {
> rswidth = DTOBT(rswidth);
> - rtextbytes = rswidth << blocklog;
> + rtextbytes = (__uint64_t)rswidth << blocklog;
> if (XFS_MIN_RTEXTSIZE <= rtextbytes &&
> (rtextbytes <= XFS_MAX_RTEXTSIZE)) {
> rtextblocks = rswidth;
I dislike unexplained casts in code like this. Nobody knows exactly
why it is there. A better fix is to change the definition of
rswidth to a 64 bit type so casts are not ever necessary...
Cheers,
Dave.
--
Dave Chinner
david@fromorbit.com
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next prev parent reply other threads:[~2015-12-03 5:54 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-12-02 11:19 [PATCH 00/11] xfsprogs misc fixes Vivek Trivedi
2015-12-02 11:19 ` [PATCH 01/11] xfsprogs: xfs_io: fix a memory leak in imap_f Vivek Trivedi
2015-12-02 17:55 ` Eric Sandeen
2015-12-02 11:19 ` [PATCH 02/11] xfsprogs: fix integer overflow in xlog_find_verify_cycle Vivek Trivedi
2015-12-02 17:58 ` Eric Sandeen
2015-12-03 5:49 ` Dave Chinner
2015-12-02 11:19 ` [PATCH 03/11] xfsprogs: mkfs: fix unintentional integer overflow Vivek Trivedi
2015-12-03 3:34 ` Eric Sandeen
2015-12-03 5:54 ` Dave Chinner [this message]
2015-12-02 11:19 ` [PATCH 04/11] xfsprogs: xfsdb: remove unnessary checks in process_leaf_node_dir_v2_free Vivek Trivedi
2015-12-03 5:57 ` Dave Chinner
2015-12-02 11:19 ` [PATCH 05/11] xfsprogs: xfs_mdrestore: check bad read count in perform_restore Vivek Trivedi
2015-12-03 4:54 ` Eric Sandeen
2015-12-03 5:59 ` Dave Chinner
2015-12-03 6:05 ` Eric Sandeen
2015-12-02 11:19 ` [PATCH 06/11] xfsprogs: xfs_db: check null derefernce after block_to_bt Vivek Trivedi
2015-12-03 5:43 ` Eric Sandeen
2015-12-02 11:19 ` [PATCH 07/11] xfsprogs: xfs_fsr: replace sprintf with snprintf to avoid buffer overflow Vivek Trivedi
2015-12-03 5:44 ` Eric Sandeen
2015-12-03 6:07 ` Dave Chinner
2015-12-02 11:19 ` [PATCH 08/11] xfsprogs: xfs_repair: fix possible null dereference in build_ino_tree Vivek Trivedi
2015-12-03 6:19 ` Dave Chinner
2015-12-02 11:19 ` [PATCH 09/11] xfsprogs: xfs_repair: fix possible null dereference in traverse_int_dir2block Vivek Trivedi
2015-12-03 5:51 ` Eric Sandeen
2015-12-03 6:22 ` Dave Chinner
2015-12-02 11:19 ` [PATCH 10/11] xfsprogs: fix possible null pointer dereference in xfs_iformat_extents Vivek Trivedi
2015-12-03 6:31 ` Dave Chinner
2015-12-02 11:19 ` [PATCH 11/11] xfsprogs: xfs_repair: fix possible null pointer dereference in mark_standalone_inodes Vivek Trivedi
2015-12-03 6:34 ` Dave Chinner
2015-12-02 15:10 ` [PATCH 00/11] xfsprogs misc fixes Eric Sandeen
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