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Date: Wed, 9 Dec 2015 22:51:34 +0100 From: Miklos Szeredi <miklos@...redi.hu> To: Konstantin Khlebnikov <khlebnikov@...dex-team.ru> Cc: David Howells <dhowells@...hat.com>, Al Viro <viro@...iv.linux.org.uk>, Kernel Mailing List <linux-kernel@...r.kernel.org>, stable@...r.kernel.org, "linux-unionfs@...r.kernel.org" <linux-unionfs@...r.kernel.org> Subject: Re: [PATCH] ovl: check dentry positiveness in ovl_cleanup_whiteouts() On Mon, Nov 16, 2015 at 4:44 PM, Konstantin Khlebnikov <khlebnikov@...dex-team.ru> wrote: > This patch fixes kernel crash at removing directory which contains > whiteouts from lower layers. > > Cache of directory content passed as "list" contains entries from all > layers, including whiteouts from lower layers. So, lookup in upper dir > (moved into work at this stage) will return negative entry. Plus this > cache is filled long before and we can race with external removal. > > Example: > mkdir -p lower0/dir lower1/dir upper work overlay > touch lower0/dir/a lower0/dir/b > mknod lower1/dir/a c 0 0 > mount -t overlay none overlay -o lowerdir=lower1:lower0,upperdir=upper,workdir=work > rm -fr overlay/dir > > Signed-off-by: Konstantin Khlebnikov <khlebnikov@...dex-team.ru> > Cc: Stable <stable@...r.kernel.org> # 3.18+ Thanks, applied. Miklos -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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