CIFS: Fix a possible memory corruption in push locks
[ Upstream commit e3d240e9 ] If maxBuf is not 0 but less than a size of SMB2 lock structure we can end up with a memory corruption. Cc: Stable <stable@vger.kernel.org> Signed-off-by: Pavel Shilovsky <pshilov@microsoft.com> Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
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