[PATCH] x86_64: Fix 32bit thread coredumps

When a register set is passed in don't try to fix up the pointer.

Noticed by Al Viro

Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 1 insertions, 2 deletions

diff --git a/arch/x86_64/ia32/ia32_binfmt.c b/arch/x86_64/ia32/ia32_binfmt.c
index 830feb272eca..2b760d0d9ce2 100644
--- a/arch/x86_64/ia32/ia32_binfmt.c
+++ b/arch/x86_64/ia32/ia32_binfmt.c
@@ -217,8 +217,7 @@ elf_core_copy_task_fpregs(struct task_struct *tsk, struct pt_regs *regs, elf_fpr
         if (!tsk_used_math(tsk))
                 return 0;
         if (!regs)
-                regs = (struct pt_regs *)tsk->thread.rsp0;
-        --regs;
+                regs = ((struct pt_regs *)tsk->thread.rsp0) - 1;
         if (tsk == current)
                 unlazy_fpu(tsk);
         set_fs(KERNEL_DS);