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authorPan Bian <bianpan2016@163.com>2018-11-23 15:56:33 +0800
committerAl Viro <viro@zeniv.linux.org.uk>2018-11-23 09:08:17 -0500
commit2084ac6c505a58f7efdec13eba633c6aaa085ca5 (patch)
tree11c18c7638bbeb0a09ee26cacd61f3a98ad893e8 /lib
parent909e22e05353a783c526829427e9a8de122fba9c (diff)
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')
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