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s390/simd: clear vector register pointer on fork/clone

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The copy_thread function fails to reset the p->thread.vxrs pointer.
This causes the child to use the same vector register save area,
causing both data corruptions and multiple frees of the memory for
the save area after the tasks sharing the save area terminate.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky 2014-12-01 18:05:35 +01:00
parent 8461b63ca0
commit 4b4ee3ee0b
1 changed files with 1 additions and 0 deletions
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arch/s390/kernel/process.c
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@ -153,6 +153,7 @@ int copy_thread(unsigned long clone_flags, unsigned long new_stackp,
save_fp_ctl(&p->thread.fp_regs.fpc);
save_fp_regs(p->thread.fp_regs.fprs);
p->thread.fp_regs.pad = 0;
p->thread.vxrs = NULL;
/* Set a new TLS ? */
if (clone_flags & CLONE_SETTLS) {
unsigned long tls = frame->childregs.gprs[6];