From: Miklos Szeredi mszeredi@redhat.com

stable inclusion from stable-v4.19.201 commit 00260209e140aae7f1a274b27e29fa6b4e986f95 category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I7XMB3 CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...

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commit a9d1c4c6df0e568207907c04aed9e7beb1294c42 upstream.

If the LOOKUP request triggered from fuse_dentry_revalidate() is interrupted, then the dentry will be invalidated, possibly resulting in submounts being unmounted.

Reported-by: Xu Rongbo xurongbo@baidu.com Closes: https://lore.kernel.org/all/CAJfpegswN_CJJ6C3RZiaK6rpFmNyWmXfaEpnQUJ42KCwNF5... Fixes: 9e6268db496a ("[PATCH] FUSE - read-write operations") Cc: stable@vger.kernel.org Signed-off-by: Miklos Szeredi mszeredi@redhat.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: ZhaoLong Wang wangzhaolong1@huawei.com --- fs/fuse/dir.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c index b468ccb296c3..6068955995da 100644 --- a/fs/fuse/dir.c +++ b/fs/fuse/dir.c @@ -232,7 +232,7 @@ static int fuse_dentry_revalidate(struct dentry *entry, unsigned int flags) spin_unlock(&fc->lock); } kfree(forget); - if (ret == -ENOMEM) + if (ret == -ENOMEM || ret == -EINTR) goto out; if (ret || fuse_invalid_attr(&outarg.attr) || (outarg.attr.mode ^ inode->i_mode) & S_IFMT)