ovl: fix UAF in ovl_do_mkdir() debug print - #2651
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ovl_do_mkdir() prints the input dentry with %pd after vfs_mkdir(). Since commit fe497f0 ("VFS: change vfs_mkdir() to unlock on failure."), vfs_mkdir() calls end_creating() on the input dentry on failure and may replace it on success, so the post-call %pd can use-after-free the dentry when CONFIG_OVERLAY_FS_DEBUG is enabled. Print the dentry before the call and only the result afterward. Reported-by: syzbot+ced26b784bf977d223dd@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=ced26b784bf977d223dd Fixes: fe497f0 ("VFS: change vfs_mkdir() to unlock on failure.") Signed-off-by: Amir Goldstein <amir73il@gmail.com>
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Series: https://patchwork.kernel.org/project/linux-fsdevel/list/?series=1170273
Submitter: Amir Goldstein
Version: 1
Patches: 1/1
Message-ID:
<20260921104013.40475-1-amir73il@gmail.com>Base: vfs.base.ci
Lore: https://lore.kernel.org/linux-fsdevel/20260921104013.40475-1-amir73il@gmail.com
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