* FAILED: patch "[PATCH] hv: don't reset hv_context.tsc_page on crash" failed to apply to 4.4-stable tree
@ 2017-03-10 7:56 gregkh
0 siblings, 0 replies; only message in thread
From: gregkh @ 2017-03-10 7:56 UTC (permalink / raw)
To: vkuznets, gregkh, kys, stable; +Cc: stable
The patch below does not apply to the 4.4-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
>From 56ef6718a1d8d77745033c5291e025ce18504159 Mon Sep 17 00:00:00 2001
From: Vitaly Kuznetsov <vkuznets@redhat.com>
Date: Wed, 7 Dec 2016 01:16:27 -0800
Subject: [PATCH] hv: don't reset hv_context.tsc_page on crash
It may happen that secondary CPUs are still alive and resetting
hv_context.tsc_page will cause a consequent crash in read_hv_clock_tsc()
as we don't check for it being not NULL there. It is safe as we're not
freeing this page anyways.
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/hv/hv.c b/drivers/hv/hv.c
index 13937563c9db..fbd8ce6d7ff3 100644
--- a/drivers/hv/hv.c
+++ b/drivers/hv/hv.c
@@ -309,9 +309,10 @@ void hv_cleanup(bool crash)
hypercall_msr.as_uint64 = 0;
wrmsrl(HV_X64_MSR_REFERENCE_TSC, hypercall_msr.as_uint64);
- if (!crash)
+ if (!crash) {
vfree(hv_context.tsc_page);
- hv_context.tsc_page = NULL;
+ hv_context.tsc_page = NULL;
+ }
}
#endif
}
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2017-03-10 7:56 FAILED: patch "[PATCH] hv: don't reset hv_context.tsc_page on crash" failed to apply to 4.4-stable tree gregkh
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