tree a72a8e3cec0feda71176991698003d9506206101
parent 420070af36da0f76d0c9acbd1de1fb7d9761160f
author Ross Lagerwall <ross.lagerwall@citrix.com> 1546972256 +0000
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1550654310 +0100

cifs: Limit memory used by lock request calls to a page

[ Upstream commit 92a8109e4d3a34fb6b115c9098b51767dc933444 ]

The code tries to allocate a contiguous buffer with a size supplied by
the server (maxBuf). This could fail if memory is fragmented since it
results in high order allocations for commonly used server
implementations. It is also wasteful since there are probably
few locks in the usual case. Limit the buffer to be no larger than a
page to avoid memory allocation failures due to fragmentation.

Signed-off-by: Ross Lagerwall <ross.lagerwall@citrix.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>