linux-kernel - Re: [syzbot] [v9fs?] KMSAN: uninit-value in v9fs_evict

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Date: Mon, 18 Mar 2024 21:49:00 +0000
From: Charalampos Mitrodimas <charmitro@...teo.net>
To: syzbot <syzbot+eb83fe1cce5833cd66a0@...kaller.appspotmail.com>
Cc: asmadeus@...ewreck.org, ericvh@...nel.org, linux-fsdevel@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux_oss@...debyte.com, lucho@...kov.net,
 syzkaller-bugs@...glegroups.com, v9fs@...ts.linux.dev
Subject: Re: [syzbot] [v9fs?] KMSAN: uninit-value in v9fs_evict_inode

please test uv in v9fs_evict_inode

#syz test 
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master

diff --git a/fs/9p/vfs_inode.c b/fs/9p/vfs_inode.c
index 360a5304ec03..5d046f63e5fa 100644
--- a/fs/9p/vfs_inode.c
+++ b/fs/9p/vfs_inode.c
@@ -353,7 +353,8 @@ void v9fs_evict_inode(struct inode *inode)
      filemap_fdatawrite(&inode->i_data);

  #ifdef CONFIG_9P_FSCACHE
-    fscache_relinquish_cookie(v9fs_inode_cookie(v9inode), false);
+    if (v9fs_inode_cookie(v9inode))
+        fscache_relinquish_cookie(v9fs_inode_cookie(v9inode), false);
  #endif
  }