arm64/ptrace: Don't clear calling process' TIF_SME on OOM

If allocating memory for the target SVE state in za_set() fails we clear
TIF_SME for the ptracing task which is obviously not correct.  If we are
here we know that the target task already had neither TIF_SVE nor
TIF_SME set since we only need to allocate if either the target had not
used either SVE or SME and had no need to allocate state before or we
just changed the vector length with vec_set_vector_length() which clears
TIF_ for us on allocation failure so just remove the clear entirely.

Reported-by: Wang ShaoBo <[email protected]>
Signed-off-by: Mark Brown <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Will Deacon <[email protected]>

Author: broonie

arch/arm64/kernel/ptrace.c

@@ -1084,7 +1084,6 @@ static int za_set(struct task_struct *target,
 	if (!target->thread.sve_state) {
 		sve_alloc(target, false);
 		if (!target->thread.sve_state) {
-			clear_thread_flag(TIF_SME);
 			ret = -ENOMEM;
 			goto out;
 		}
@@ -1094,7 +1093,6 @@ static int za_set(struct task_struct *target,
 	sme_alloc(target);
 	if (!target->thread.za_state) {
 		ret = -ENOMEM;
-		clear_tsk_thread_flag(target, TIF_SME);
 		goto out;
 	}