ubifs: make ubifs_[get|set]xattr atomic

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This commit make the ubifs_[get|set]xattr protected by ui_mutex.

Originally, there is a possibility that ubifs_getxattr to get
a wrong value.

  P1                                  P2
----------                  	----------
ubifs_getxattr                      ubifs_setxattr
					- kfree()
- memcpy()
					- kmemdup()

Then ubifs_getxattr() would get a non-sense data. To solve this
problem, this commit make the xattr of ubifs_inode updated in
atomic.

Signed-off-by: Dongsheng Yang <yangds.fnst@cn.fujitsu.com>
Signed-off-by: Richard Weinberger <richard@nod.at>

...

This commit is contained in:

Dongsheng Yang 2015-08-18 12:38:36 +08:00 • committed by Richard Weinberger

parent 54bcfdf19e

commit ab92a20bce

1 changed files with 9 additions and 3 deletions

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fs/ubifs/xattr.c

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