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linux/fs/erofs
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Gao Xiang a70bc7cc76 erofs: zero out when listxattr is called with no xattr 
commit 926d165017 upstream.

As David reported [1], ENODATA returns when attempting
to modify files by using EROFS as an overlayfs lower layer.

The root cause is that listxattr could return unexpected
-ENODATA by mistake for inodes without xattr. That breaks
listxattr return value convention and it can cause copy
up failure when used with overlayfs.

Resolve by zeroing out if no xattr is found for listxattr.

[1] https://lore.kernel.org/r/CAEvUa7nxnby+rxK-KRMA46=exeOMApkDMAV08AjMkkPnTPV4CQ@mail.gmail.com
Link: https://lore.kernel.org/r/20191201084040.29275-1-hsiangkao@aol.com
Fixes: cadf1ccf1b ("staging: erofs: add error handling for xattr submodule")
Cc: <stable@vger.kernel.org> # 4.19+
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 		2019-12-17 19:56:23 +01:00
..
Kconfig
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Makefile
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compress.h
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data.c erofs: fix erofs_get_meta_page locking due to a cleanup 2019-10-01 04:54:33 +08:00
decompressor.c erofs: rename errln/infoln/debugln to erofs_{err, info, dbg} 2019-09-05 20:10:09 +02:00
dir.c erofs: rename errln/infoln/debugln to erofs_{err, info, dbg} 2019-09-05 20:10:09 +02:00
erofs_fs.h
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inode.c erofs: always use iget5_locked 2019-09-05 20:10:09 +02:00
internal.h erofs: rename errln/infoln/debugln to erofs_{err, info, dbg} 2019-09-05 20:10:09 +02:00
namei.c erofs: rename errln/infoln/debugln to erofs_{err, info, dbg} 2019-09-05 20:10:09 +02:00
super.c erofs: fix return value check in erofs_read_superblock() 2019-10-01 04:53:50 +08:00
tagptr.h
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utils.c
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xattr.c erofs: zero out when listxattr is called with no xattr 2019-12-17 19:56:23 +01:00
xattr.h
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zdata.c erofs: fix mis-inplace determination related with noio chain 2019-10-01 04:54:45 +08:00
zdata.h erofs: rename errln/infoln/debugln to erofs_{err, info, dbg} 2019-09-05 20:10:09 +02:00
zmap.c erofs: rename errln/infoln/debugln to erofs_{err, info, dbg} 2019-09-05 20:10:09 +02:00
zpvec.h
…