From: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
[ Upstream commit 40a3cb0d2314a41975aa385a74643878454f6eac ]
All callers of d_alloc_parallel() must make sure that resulting
in-lookup dentry (if any) will encounter __d_lookup_done() before
the final dput(). d_add_ci() might end up creating in-lookup
dentries; they are fed to d_splice_alias(), which will normally
make sure they meet __d_lookup_done(). However, it is possible
to end up with d_splice_alias() failing with ERR_PTR(-ELOOP)
without having done so. It takes a corrupted ntfs or case-insensitive
xfs image, but neither should end up with memory corruption...
Signed-off-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
fs/dcache.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/fs/dcache.c b/fs/dcache.c
index 05bad55352bb..e42c715fc9e9 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -2089,6 +2089,7 @@ struct dentry *d_add_ci(struct dentry *dentry, struct inode *inode,
}
res = d_splice_alias(inode, found);
if (res) {
+ d_lookup_done(found);
dput(found);
return res;
}
--
2.35.1
