samsung-sm8650/android_kernel_samsung_sm8650-modules
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disp: msm: sde: add mutex lock to protect wb_dev

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There is null pointer dereference seen due to concurrency
of wb_get_modes from userspace and clearing of writeback
modes in wb_reset. This change acquires mutex lock to provide
exclusive access to wb_dev effectively preventing such
concurrency issues.

Change-Id: Idd38e38696c839f557b94aa9313761d4d7738902
Signed-off-by: Yojana Juadi <quic_yjuadi@quicinc.com>
Signed-off-by: Akash Gajjar <quic_agajjar@quicinc.com>
This commit is contained in:
Yojana Juadi
2023-08-11 11:05:36 +05:30
committad av Akash Gajjar
förälder 3790db7fbd
incheckning f995116812
1 ändrade filer med 5 tillägg och 3 borttagningar
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msm/sde/sde_encoder_phys_wb.c
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@@ -2145,12 +2145,14 @@ static void _sde_encoder_phys_wb_reset_state(struct sde_encoder_phys *phys_enc)
phys_enc->hw_cdm = NULL;
phys_enc->hw_ctl = NULL;
phys_enc->in_clone_mode = false;
kfree(wb_dev->modes);
wb_dev->modes = NULL;
wb_dev->count_modes = 0;
atomic_set(&phys_enc->pending_kickoff_cnt, 0);
atomic_set(&phys_enc->pending_retire_fence_cnt, 0);
atomic_set(&phys_enc->pending_ctl_start_cnt, 0);
mutex_lock(&wb_dev->wb_lock);
kfree(wb_dev->modes);
wb_dev->modes = NULL;
wb_dev->count_modes = 0;
mutex_unlock(&wb_dev->wb_lock);
}
static int _sde_encoder_phys_wb_wait_for_idle(struct sde_encoder_phys *phys_enc, bool force_wait)