6.10-stable review patch. If anyone has any objections, please let me know.
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From: Heiko Carstens hca@linux.ibm.com
commit 4734406c39238cbeafe66f0060084caa3247ff53 upstream.
With the recent rewrite of the fpu code exception handling for the lfpc instruction within load_fpu_state() was erroneously removed.
Add it again to prevent that loading invalid floating point register values cause an unhandled specification exception.
Fixes: 8c09871a950a ("s390/fpu: limit save and restore to used registers") Cc: stable@vger.kernel.org Reported-by: Aristeu Rozanski aris@redhat.com Tested-by: Aristeu Rozanski aris@redhat.com Reviewed-by: Vasily Gorbik gor@linux.ibm.com Signed-off-by: Heiko Carstens hca@linux.ibm.com Signed-off-by: Vasily Gorbik gor@linux.ibm.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/s390/kernel/fpu.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/s390/kernel/fpu.c b/arch/s390/kernel/fpu.c index fa90bbdc5ef9..6f2e87920288 100644 --- a/arch/s390/kernel/fpu.c +++ b/arch/s390/kernel/fpu.c @@ -113,7 +113,7 @@ void load_fpu_state(struct fpu *state, int flags) int mask;
if (flags & KERNEL_FPC) - fpu_lfpc(&state->fpc); + fpu_lfpc_safe(&state->fpc); if (!cpu_has_vx()) { if (flags & KERNEL_VXR_V0V7) load_fp_regs_vx(state->vxrs);