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authorPan Bian <bianpan2016@163.com>2018-11-23 15:56:33 +0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-12-17 09:38:33 +0100
commitd2139ee71c89345e946f4df175d87bfce3dbe363 (patch)
treee9dd2cc384ab013d8e16e34e5e516c3cd11e2e9f /kernel
parent476a607331b7cc51a5283e344b11b19ac04ef72f (diff)
exportfs: do not read dentry after free
[ Upstream commit 2084ac6c505a58f7efdec13eba633c6aaa085ca5 ] 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>
Diffstat (limited to 'kernel')
0 files changed, 0 insertions, 0 deletions