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ovl: fix dentry reference leak after changes to underlying layers
syzbot excersized the forbidden practice of moving the workdir under lowerdir while overlayfs is mounted and tripped a dentry reference leak. Fixes: c63e56a ("ovl: do not open/llseek lower file with upper sb_writers held") Reported-by: syzbot+8608bb4553edb8c78f41@syzkaller.appspotmail.com Signed-off-by: Amir Goldstein <amir73il@gmail.com>
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