evie/android_kernel_oneplus_msm8998
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diag: Add protection before accessing md_session_map

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Currently protection is missing while accessing global
variable md_session_map. The patch adds protection before
accessing the same.

Change-Id: I165b9a7900cec20ca7970b37ca4823e2186fe27c
Signed-off-by: Hardik Arya <harya@codeaurora.org>
This commit is contained in:
Hardik Arya 2018-04-05 13:05:04 +05:30
parent 11ee621aea
commit 4f36d854e7
1 changed files with 3 additions and 0 deletions
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3
drivers/char/diag/diagchar_core.c
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@ -1747,15 +1747,18 @@ static int diag_switch_logging(struct diag_logging_mode_param_t *param)
i = upd - UPD_WLAN; i = upd - UPD_WLAN;
mutex_lock(&driver->md_session_lock);
if (driver->md_session_map[peripheral] && if (driver->md_session_map[peripheral] &&
(MD_PERIPHERAL_MASK(peripheral) & (MD_PERIPHERAL_MASK(peripheral) &
diag_mux->mux_mask) && diag_mux->mux_mask) &&
!driver->pd_session_clear[i]) { !driver->pd_session_clear[i]) {
DIAG_LOG(DIAG_DEBUG_USERSPACE, DIAG_LOG(DIAG_DEBUG_USERSPACE,
"diag_fr: User PD is already logging onto active peripheral logging\n"); "diag_fr: User PD is already logging onto active peripheral logging\n");
mutex_unlock(&driver->md_session_lock);
driver->pd_session_clear[i] = 0; driver->pd_session_clear[i] = 0;
return -EINVAL; return -EINVAL;
} }
mutex_unlock(&driver->md_session_lock);
peripheral_mask = peripheral_mask =
diag_translate_mask(param->pd_mask); diag_translate_mask(param->pd_mask);
param->peripheral_mask = peripheral_mask; param->peripheral_mask = peripheral_mask;