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

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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 <bobo.shaobowang@huawei.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20220902132802.39682-1-broonie@kernel.org
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Mark Brown 2022-09-02 14:28:02 +01:00 committed by Will Deacon
parent c0a454b904
commit d105d6920e
1 changed files with 0 additions and 2 deletions
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2
arch/arm64/kernel/ptrace.c
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@ -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;
}