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x86/fpu/xstate: Return NULL for disabled xstate component address

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It is an error to request a disabled XSAVE/XSAVES component address.
For that case, make __raw_xsave_addr() return a NULL and issue a
warning.

Signed-off-by: Yu-cheng Yu <yu-cheng.yu@intel.com>
Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
Reviewed-by: Dave Hansen <dave.hansen@intel.com>
Cc: H. Peter Anvin <h.peter.anvin@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ravi V Shankar <ravi.v.shankar@intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1468253937-40008-3-git-send-email-fenghua.yu@intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Yu-cheng Yu 2016-07-11 09:18:55 -07:00 committed by Ingo Molnar
parent 1fc2b67b43
commit 5060b91513
1 changed files with 5 additions and 0 deletions
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5
arch/x86/kernel/fpu/xstate.c
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@ -760,6 +760,11 @@ void *__raw_xsave_addr(struct xregs_state *xsave, int xstate_feature_mask)
{
int feature_nr = fls64(xstate_feature_mask) - 1;
if (!xfeature_enabled(feature_nr)) {
WARN_ON_FPU(1);
return NULL;
}
return (void *)xsave + xstate_comp_offsets[feature_nr];
}
/*