CIFS: fix deadlock in cached root handling

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Prevent deadlock between open_shroot() and
cifs_mark_open_files_invalid() by releasing the lock before entering
SMB2_open, taking it again after and checking if we still need to use
the result.

Link: https://lore.kernel.org/linux-cifs/684ed01c-cbca-2716-bc28-b0a59a0f8521@prodrive-technologies.com/T/#u
Fixes: 3d4ef9a153 ("smb3: fix redundant opens on root")
Signed-off-by: Aurelien Aptel <aaptel@suse.com>
Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
CC: Stable <stable@vger.kernel.org>

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Aurelien Aptel 2019-07-17 12:46:28 +02:00 • committed by Steve French

parent ae9b728c8d

commit 7e5a70ad88

1 changed files with 45 additions and 1 deletions

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fs/cifs/smb2ops.c

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