Gao Feng 37633f021b
tcp: sysctl: Fix a race to avoid unexpected 0 window from space ...
[ Upstream commit c48367427a39ea0b85c7cf018fe4256627abfd9e ]
Because sysctl_tcp_adv_win_scale could be changed any time, so there
is one race in tcp_win_from_space.
For example,
1.sysctl_tcp_adv_win_scale<=0 (sysctl_tcp_adv_win_scale is negative now)
2.space>>(-sysctl_tcp_adv_win_scale) (sysctl_tcp_adv_win_scale is postive now)
As a result, tcp_win_from_space returns 0. It is unexpected.
Certainly if the compiler put the sysctl_tcp_adv_win_scale into one
register firstly, then use the register directly, it would be ok.
But we could not depend on the compiler behavior.
Signed-off-by: Gao Feng <fgao@ikuai8.com >
Signed-off-by: David S. Miller <davem@davemloft.net >
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com >
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org >
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37633f021b