Konstantin Khlebnikov 84889d4933 ovl: check dentry positiveness in ovl_cleanup_whiteouts() ... 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@yandex-team.ru> Signed-off-by: Miklos Szeredi <miklos@szeredi.hu> Cc: <stable@vger.kernel.org> # 3.18+		2015-12-11 16:30:49 +01:00
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copy_up.c	ovl: use a minimal buffer in ovl_copy_xattr	2015-11-10 17:08:42 +01:00
dir.c	ovl: mount read-only if workdir can't be created	2015-05-19 14:30:12 +02:00
inode.c	ovl: setattr: check permissions before copy-up	2015-12-11 16:30:49 +01:00
Kconfig	ovl: rename filesystem type to "overlay"	2014-11-20 16:39:59 +01:00
Makefile	ovl: rename filesystem type to "overlay"	2014-11-20 16:39:59 +01:00
overlayfs.h	ovl: default permissions	2015-10-12 17:11:44 +02:00
readdir.c	ovl: check dentry positiveness in ovl_cleanup_whiteouts()	2015-12-11 16:30:49 +01:00
super.c	ovl: setattr: check permissions before copy-up	2015-12-11 16:30:49 +01:00