From 89e6cf1c0ab5590ff134d89ac6c9b892d818d097 Mon Sep 17 00:00:00 2001 From: Miklos Szeredi Date: Tue, 19 May 2020 14:50:38 +0200 Subject: [PATCH] fuse: update attr_version counter on fuse_notify_inval_inode() [ Upstream commit 5ddd9ced9aef6cfa76af27d384c17c9e2d610ce8 ] A GETATTR request can race with FUSE_NOTIFY_INVAL_INODE, resulting in the attribute cache being updated with stale information after the invalidation. Fix this by bumping the attribute version in fuse_reverse_inval_inode(). Reported-by: Krzysztof Rusek Signed-off-by: Miklos Szeredi Signed-off-by: Sasha Levin --- fs/fuse/inode.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c index 5dca643a257c..f58ab84b09fb 100644 --- a/fs/fuse/inode.c +++ b/fs/fuse/inode.c @@ -323,6 +323,8 @@ struct inode *fuse_iget(struct super_block *sb, u64 nodeid, int fuse_reverse_inval_inode(struct super_block *sb, u64 nodeid, loff_t offset, loff_t len) { + struct fuse_conn *fc = get_fuse_conn_super(sb); + struct fuse_inode *fi; struct inode *inode; pgoff_t pg_start; pgoff_t pg_end; @@ -331,6 +333,11 @@ int fuse_reverse_inval_inode(struct super_block *sb, u64 nodeid, if (!inode) return -ENOENT; + fi = get_fuse_inode(inode); + spin_lock(&fi->lock); + fi->attr_version = atomic64_inc_return(&fc->attr_version); + spin_unlock(&fi->lock); + fuse_invalidate_attr(inode); forget_all_cached_acls(inode); if (offset >= 0) {