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    Subject[PATCH 5.10 344/575] x86/sev: Fix stack type check in vc_switch_off_ist()
    Date
    From: Joerg Roedel <jroedel@suse.de>

    [ Upstream commit 5681981fb788281b09a4ea14d310d30b2bd89132 ]

    The value of STACK_TYPE_EXCEPTION_LAST points to the last _valid_
    exception stack. Reflect that in the check done in the
    vc_switch_off_ist() function.

    Fixes: a13644f3a53de ("x86/entry/64: Add entry code for #VC handler")
    Reported-by: Tom Lendacky <thomas.lendacky@amd.com>
    Signed-off-by: Joerg Roedel <jroedel@suse.de>
    Signed-off-by: Borislav Petkov <bp@suse.de>
    Link: https://lkml.kernel.org/r/20211021080833.30875-2-joro@8bytes.org
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    arch/x86/kernel/traps.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c
    index 7692bf7908e6c..143fcb8af38f4 100644
    --- a/arch/x86/kernel/traps.c
    +++ b/arch/x86/kernel/traps.c
    @@ -701,7 +701,7 @@ asmlinkage __visible noinstr struct pt_regs *vc_switch_off_ist(struct pt_regs *r
    stack = (unsigned long *)sp;

    if (!get_stack_info_noinstr(stack, current, &info) || info.type == STACK_TYPE_ENTRY ||
    - info.type >= STACK_TYPE_EXCEPTION_LAST)
    + info.type > STACK_TYPE_EXCEPTION_LAST)
    sp = __this_cpu_ist_top_va(VC2);

    sync:
    --
    2.33.0


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