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| author | Dave Airlie <airlied@redhat.com> | 2015-08-17 14:13:53 +1000 |
|---|---|---|
| committer | Dave Airlie <airlied@redhat.com> | 2015-08-17 14:13:53 +1000 |
| commit | 4eebf60b7452fbd551fd7dece855ba7825a49cbc (patch) | |
| tree | 490b4d194ba09c90e10201ab7fc084a0bda0ed27 /arch/x86/kernel/step.c | |
| parent | 8f9cb50789e76f3e224e8861adf650e55c747af4 (diff) | |
| parent | 2c6625cd545bdd66acff14f3394865d43920a5c7 (diff) | |
Merge tag 'v4.2-rc7' into drm-next
Linux 4.2-rc7
Backmerge master for i915 fixes
Diffstat (limited to 'arch/x86/kernel/step.c')
| -rw-r--r-- | arch/x86/kernel/step.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/arch/x86/kernel/step.c b/arch/x86/kernel/step.c index 9b4d51d0c0d0..0ccb53a9fcd9 100644 --- a/arch/x86/kernel/step.c +++ b/arch/x86/kernel/step.c @@ -5,6 +5,7 @@ #include <linux/mm.h> #include <linux/ptrace.h> #include <asm/desc.h> +#include <asm/mmu_context.h> unsigned long convert_ip_to_linear(struct task_struct *child, struct pt_regs *regs) { @@ -27,13 +28,14 @@ unsigned long convert_ip_to_linear(struct task_struct *child, struct pt_regs *re struct desc_struct *desc; unsigned long base; - seg &= ~7UL; + seg >>= 3; mutex_lock(&child->mm->context.lock); - if (unlikely((seg >> 3) >= child->mm->context.size)) + if (unlikely(!child->mm->context.ldt || + seg >= child->mm->context.ldt->size)) addr = -1L; /* bogus selector, access would fault */ else { - desc = child->mm->context.ldt + seg; + desc = &child->mm->context.ldt->entries[seg]; base = get_desc_base(desc); /* 16-bit code segment? */ |