From: Christoph Hellwig <hch@infradead.org>
To: Eric Biggers <ebiggers@kernel.org>
Cc: Yongpeng Yang <yangyongpeng.storage@gmail.com>,
Jaegeuk Kim <jaegeuk@kernel.org>, Theodore Ts'o <tytso@mit.edu>,
linux-fscrypt@vger.kernel.org,
Yongpeng Yang <yangyongpeng@xiaomi.com>,
linux-fsdevel@vger.kernel.org, linux-block@vger.kernel.org,
Luis Chamberlain <mcgrof@kernel.org>
Subject: Re: [PATCH v2] fscrypt: fix left shift underflow when inode->i_blkbits > PAGE_SHIFT
Date: Tue, 4 Nov 2025 03:12:53 -0800 [thread overview]
Message-ID: <aQnftXAg93-4FbaO@infradead.org> (raw)
In-Reply-To: <20251103164829.GC1735@sol>
On Mon, Nov 03, 2025 at 08:48:29AM -0800, Eric Biggers wrote:
> > *inode_ret = inode;
> > - *lblk_num_ret = ((u64)folio->index << (PAGE_SHIFT - inode->i_blkbits)) +
> > + *lblk_num_ret = (((u64)folio->index << PAGE_SHIFT) >> inode->i_blkbits) +
This should be using folio_pos() instead of open coding the arithmetics.
next prev parent reply other threads:[~2025-11-04 11:12 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-10-30 7:29 [PATCH v2] fscrypt: fix left shift underflow when inode->i_blkbits > PAGE_SHIFT Yongpeng Yang
2025-11-03 16:48 ` Eric Biggers
2025-11-04 11:12 ` Christoph Hellwig [this message]
2025-11-04 15:05 ` Yongpeng Yang
2025-11-05 13:38 ` Christoph Hellwig
2025-11-04 18:10 ` Eric Biggers
2025-11-05 13:40 ` Christoph Hellwig
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