mirror of https://gitee.com/openkylin/linux.git
4c8941de78
If multiple CPUs races on the same req_sock in syn_recv_sock(),
flipping such field can cause inconsistent child socket status.
When racing, the CPU losing the req ownership may still change
the mptcp request socket mp_capable flag while the CPU owning
the request is cloning the socket, leaving the child socket with
'is_mptcp' set but no 'mp_capable' flag.
Such socket will stay with 'conn' field cleared, heading to oops
in later mptcp callback.
Address the issue tracking the fallback status in a local variable.
Fixes:
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|---|---|---|
| .. | ||
| Kconfig | ||
| Makefile | ||
| crypto.c | ||
| ctrl.c | ||
| diag.c | ||
| mib.c | ||
| mib.h | ||
| options.c | ||
| pm.c | ||
| pm_netlink.c | ||
| protocol.c | ||
| protocol.h | ||
| subflow.c | ||
| token.c | ||