fs/namespace: fix NULL pointer dereference in do_lock_mount()#1317
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vfsci-bot[bot] wants to merge 1 commit intovfs.base.cifrom
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fs/namespace: fix NULL pointer dereference in do_lock_mount()#1317vfsci-bot[bot] wants to merge 1 commit intovfs.base.cifrom
vfsci-bot[bot] wants to merge 1 commit intovfs.base.cifrom
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Syzkaller reported a NULL pointer dereference in do_lock_mount() when calling inode_lock() on a dentry without an associated inode. where_to_mount() may return a negative dentry (without an inode) due to concurrent unlink or mount changes. The current code does not validate this before calling inode_lock(), leading to a crash. Fix this by checking dentry and dentry->d_inode before acquiring the inode lock. Reported-by: syzbot <syzbot@syzkaller.appspotmail.com> Closes: https://syzkaller.appspot.com/ Signed-off-by: Vineet Agarwal <agarwal.vineet2006@gmail.com>
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Series: https://patchwork.kernel.org/project/linux-fsdevel/list/?series=1089768
Submitter: Vineet Agarwal
Version: 1
Patches: 1/1
Message-ID:
<20260505095156.178351-1-agarwal.vineet2006@gmail.com>Base: vfs.base.ci
Lore: https://lore.kernel.org/linux-fsdevel/20260505095156.178351-1-agarwal.vineet2006@gmail.com
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