s390/fpu: Re-add exception handling in load_fpu_state()

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: 8c09871 ("s390/fpu: limit save and restore to used registers") Cc: [email protected] Reported-by: Aristeu Rozanski <[email protected]> Tested-by: Aristeu Rozanski <[email protected]> Reviewed-by: Vasily Gorbik <[email protected]> Signed-off-by: Heiko Carstens <[email protected]> Signed-off-by: Vasily Gorbik <[email protected]>
mj22226 · Jul 31, 2024 · 4734406 · 4734406
1 parent 8400291
commit 4734406
Showing 1 changed file with 1 addition and 1 deletion.
diff --git 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);