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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: a056cc8("exportfs: stop retrying once we race with rename/remove") Signed-off-by: Pan Bian <[email protected]> Signed-off-by: Al Viro <[email protected]>
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