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| author | Pan Bian <bianpan2016@163.com> | 2018-11-23 08:56:33 +0100 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2018-11-23 15:08:17 +0100 |
| commit | 2084ac6c505a58f7efdec13eba633c6aaa085ca5 (patch) | |
| tree | 11c18c7638bbeb0a09ee26cacd61f3a98ad893e8 /lib | |
| parent | exportfs: fix 'passing zero to ERR_PTR()' warning (diff) | |
| download | linux-2084ac6c505a58f7efdec13eba633c6aaa085ca5.tar.xz linux-2084ac6c505a58f7efdec13eba633c6aaa085ca5.zip | |
exportfs: do not read dentry after free
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>
Diffstat (limited to 'lib')
0 files changed, 0 insertions, 0 deletions