From: Matthew Wilcox <willy@infradead.org>
To: Mikulas Patocka <mpatocka@redhat.com>
Cc: Jens Axboe <axboe@kernel.dk>, Christoph Hellwig <hch@lst.de>,
"Darrick J. Wong" <djwong@kernel.org>,
Mike Snitzer <msnitzer@redhat.com>,
dm-devel@redhat.com, linux-block@vger.kernel.org
Subject: Re: [PATCH] block: fix a crash when bio_for_each_folio_all iterates over an empty bio
Date: Mon, 17 Apr 2023 20:32:54 +0100 [thread overview]
Message-ID: <ZD2e5lw5CqueygSA@casper.infradead.org> (raw)
In-Reply-To: <alpine.LRH.2.21.2304171433370.17217@file01.intranet.prod.int.rdu2.redhat.com>
On Mon, Apr 17, 2023 at 03:11:57PM -0400, Mikulas Patocka wrote:
> If we use bio_for_each_folio_all on an empty bio, it will access the first
> bio vector unconditionally (it is uninitialized) and it may crash
> depending on the uninitialized data.
Wait, how do we have an empty bio in the first place?
next prev parent reply other threads:[~2023-04-17 19:33 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-04-17 19:11 [PATCH] block: fix a crash when bio_for_each_folio_all iterates over an empty bio Mikulas Patocka
2023-04-17 19:32 ` Matthew Wilcox [this message]
2023-04-17 19:56 ` Mikulas Patocka
2023-04-18 4:57 ` Christoph Hellwig
2023-04-18 15:20 ` Mike Snitzer
2023-06-09 13:22 ` Mike Snitzer
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