linux-brain/fs/exportfs
Pan Bian d2139ee71c exportfs: do not read dentry after free
[ Upstream commit 2084ac6c50 ]

The function dentry_connected calls dput(dentry) to drop the previously
acquired reference to dentry. In this case, dentry can be released.
After that, IS_ROOT(dentry) checks the condition
(dentry == dentry->d_parent), which may result in a use-after-free bug.
This patch directly compares dentry with its parent obtained before
dropping the reference.

Fixes: a056cc8934c("exportfs: stop retrying once we race with
rename/remove")

Signed-off-by: Pan Bian <bianpan2016@163.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2018-12-17 09:38:33 +01:00
..
expfs.c exportfs: do not read dentry after free 2018-12-17 09:38:33 +01:00
Makefile Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00