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authorMiklos Szeredi <mszeredi@redhat.com>2019-11-12 11:49:04 +0100
committerMiklos Szeredi <mszeredi@redhat.com>2019-11-12 11:49:04 +0100
commitc634da718db9b2fac201df2ae1b1b095344ce5eb (patch)
tree62dc321971b2bd1b977939d5ba69cb5052760450 /fs
parent8aab336b14c115c6bf1d4baeb9247e41ed9ce6de (diff)
fuse: verify nlink
When adding a new hard link, make sure that i_nlink doesn't overflow. Fixes: ac45d61357e8 ("fuse: fix nlink after unlink") Cc: <stable@vger.kernel.org> # v3.4 Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/fuse/dir.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c
index ca4ddbe21ec0..ee190119f45c 100644
--- a/fs/fuse/dir.c
+++ b/fs/fuse/dir.c
@@ -870,7 +870,8 @@ static int fuse_link(struct dentry *entry, struct inode *newdir,
spin_lock(&fi->lock);
fi->attr_version = atomic64_inc_return(&fc->attr_version);
- inc_nlink(inode);
+ if (likely(inode->i_nlink < UINT_MAX))
+ inc_nlink(inode);
spin_unlock(&fi->lock);
fuse_invalidate_attr(inode);
fuse_update_ctime(inode);