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xfs: check padding field in xfs_ioc_commit_range

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LOLLM points out that we don't check the ioctl padding field here, so
let's do that.  I don't think there are many users yet since exchrange
requires a new feature flag, so it's a good time to try to plug this
hole.

Cc: stable@vger.kernel.org # v6.12
Fixes: 398597c3ef ("xfs: introduce new file range commit ioctls")
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Assisted-by: LOLLM # finding obvious bugs
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Carlos Maiolino <cem@kernel.org>
This commit is contained in:
Darrick J. Wong 2026-09-10 22:53:39 -07:00 committed by Carlos Maiolino
parent 984aab2d90
commit 3083ba8dde
1 changed files with 1 additions and 1 deletions
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2
fs/xfs/xfs_exchrange.c
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@ -902,7 +902,7 @@ xfs_ioc_commit_range(
if (copy_from_user(&args, argp, sizeof(args)))
return -EFAULT;
if (args.flags & ~XFS_EXCHANGE_RANGE_ALL_FLAGS)
if (args.pad || (args.flags & ~XFS_EXCHANGE_RANGE_ALL_FLAGS))
return -EINVAL;
if (kern_f->magic != XCR_FRESH_MAGIC)
return -EBUSY;