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Commit ba10c615 authored by Tanya Dixit's avatar Tanya Dixit
Browse files

rtac: Add mutex lock to ensure proper fops access 



Add mutex lock in rtac_open and rtac_release
to avoid usage count discrepancies leading
to multiple calls to unmap memory resulting in
null pointer dereference.

CRs-Fixed: 2271712
Change-Id: Ie6da28837c352030b8d7e377d68a70cf04e7072a
Signed-off-by: default avatarTanya Dixit <tdixit@codeaurora.org>
parent 4a568706

sound/soc/msm/qdsp6v2/rtac.c

+13 −30
Original line number Diff line number Diff line
@@ -54,6 +54,7 @@ struct rtac_cal_block_data rtac_cal[MAX_RTAC_BLOCKS] = { 
struct rtac_common_data {

	atomic_t			usage_count;

	atomic_t			apr_err_code;

	struct mutex			rtac_fops_mutex;

};



static struct rtac_common_data		rtac_common;
@@ -127,11 +128,6 @@ struct mutex rtac_voice_mutex; 
struct mutex			rtac_voice_apr_mutex;

struct mutex			rtac_afe_apr_mutex;



static struct mutex			rtac_asm_cal_mutex;

static struct mutex			rtac_adm_cal_mutex;

static struct mutex			rtac_afe_cal_mutex;

static struct mutex			rtac_voice_cal_mutex;



int rtac_clear_mapping(uint32_t cal_type)

{

	int result = 0;
@@ -325,7 +321,9 @@ static int rtac_open(struct inode *inode, struct file *f) 
	int	result = 0;

	pr_debug("%s\n", __func__);



	mutex_lock(&rtac_common.rtac_fops_mutex);

	atomic_inc(&rtac_common.usage_count);

	mutex_unlock(&rtac_common.rtac_fops_mutex);

	return result;

}
@@ -336,12 +334,15 @@ static int rtac_release(struct inode *inode, struct file *f) 
	int	i;

	pr_debug("%s\n", __func__);



	mutex_lock(&rtac_common.rtac_fops_mutex);

	atomic_dec(&rtac_common.usage_count);

	pr_debug("%s: ref count %d!\n", __func__,

		atomic_read(&rtac_common.usage_count));



	if (atomic_read(&rtac_common.usage_count) > 0)

	if (atomic_read(&rtac_common.usage_count) > 0) {

		mutex_unlock(&rtac_common.rtac_fops_mutex);

		goto done;

	}



	for (i = 0; i < MAX_RTAC_BLOCKS; i++) {

		result2 = rtac_unmap_cal_buffer(i);
@@ -358,6 +359,7 @@ static int rtac_release(struct inode *inode, struct file *f) 
			result = result2;

		}

	}

	mutex_unlock(&rtac_common.rtac_fops_mutex);

done:

	return result;

}
@@ -1698,62 +1700,42 @@ static long rtac_ioctl_shared(struct file *f, 
	}



	case AUDIO_GET_RTAC_ADM_CAL:

		mutex_lock(&rtac_adm_cal_mutex);

		result = send_adm_apr((void *)arg, ADM_CMD_GET_PP_PARAMS_V5);

		mutex_unlock(&rtac_adm_cal_mutex);

		break;

	case AUDIO_SET_RTAC_ADM_CAL:

		mutex_lock(&rtac_adm_cal_mutex);

		result = send_adm_apr((void *)arg, ADM_CMD_SET_PP_PARAMS_V5);

		mutex_unlock(&rtac_adm_cal_mutex);

		break;

	case AUDIO_GET_RTAC_ASM_CAL:

		mutex_lock(&rtac_asm_cal_mutex);

		result = send_rtac_asm_apr((void *)arg,

			ASM_STREAM_CMD_GET_PP_PARAMS_V2);

		mutex_unlock(&rtac_asm_cal_mutex);

		break;

	case AUDIO_SET_RTAC_ASM_CAL:

		mutex_lock(&rtac_asm_cal_mutex);

		result = send_rtac_asm_apr((void *)arg,

			ASM_STREAM_CMD_SET_PP_PARAMS_V2);

		mutex_unlock(&rtac_asm_cal_mutex);

		break;

	case AUDIO_GET_RTAC_CVS_CAL:

		mutex_lock(&rtac_voice_cal_mutex);

		result = send_voice_apr(RTAC_CVS, (void *)arg,

			VOICE_CMD_GET_PARAM);

		mutex_unlock(&rtac_voice_cal_mutex);

		break;

	case AUDIO_SET_RTAC_CVS_CAL:

		mutex_lock(&rtac_voice_cal_mutex);

		result = send_voice_apr(RTAC_CVS, (void *)arg,

			VOICE_CMD_SET_PARAM);

		mutex_unlock(&rtac_voice_cal_mutex);

		break;

	case AUDIO_GET_RTAC_CVP_CAL:

		mutex_lock(&rtac_voice_cal_mutex);

		result = send_voice_apr(RTAC_CVP, (void *)arg,

			VOICE_CMD_GET_PARAM);

		mutex_unlock(&rtac_voice_cal_mutex);

		break;

	case AUDIO_SET_RTAC_CVP_CAL:

		mutex_lock(&rtac_voice_cal_mutex);

		result = send_voice_apr(RTAC_CVP, (void *)arg,

			VOICE_CMD_SET_PARAM);

		mutex_unlock(&rtac_voice_cal_mutex);

		break;

	case AUDIO_GET_RTAC_AFE_CAL:

		mutex_lock(&rtac_afe_cal_mutex);

		result = send_rtac_afe_apr((void *)arg,

			AFE_PORT_CMD_GET_PARAM_V2);

		mutex_unlock(&rtac_afe_cal_mutex);

		break;

	case AUDIO_SET_RTAC_AFE_CAL:

		mutex_lock(&rtac_afe_cal_mutex);

		result = send_rtac_afe_apr((void *)arg,

			AFE_PORT_CMD_SET_PARAM_V2);

		mutex_unlock(&rtac_afe_cal_mutex);

		break;

	default:

		pr_err("%s: Invalid IOCTL, command = %d!\n",
@@ -1769,6 +1751,7 @@ static long rtac_ioctl(struct file *f, 
{

	int result = 0;



	mutex_lock(&rtac_common.rtac_fops_mutex);

	if (!arg) {

		pr_err("%s: No data sent to driver!\n", __func__);

		result = -EFAULT;
@@ -1776,6 +1759,7 @@ static long rtac_ioctl(struct file *f, 
		result = rtac_ioctl_shared(f, cmd, (void __user *)arg);

	}



	mutex_unlock(&rtac_common.rtac_fops_mutex);

	return result;

}
@@ -1798,6 +1782,7 @@ static long rtac_compat_ioctl(struct file *f, 
{

	int result = 0;



	mutex_lock(&rtac_common.rtac_fops_mutex);

	if (!arg) {

		pr_err("%s: No data sent to driver!\n", __func__);

		result = -EINVAL;
@@ -1850,6 +1835,7 @@ process: 
		break;

	}

done:

	mutex_unlock(&rtac_common.rtac_fops_mutex);

	return result;

}

#else
@@ -1877,6 +1863,7 @@ static int __init rtac_init(void) 
	/* Driver */

	atomic_set(&rtac_common.usage_count, 0);

	atomic_set(&rtac_common.apr_err_code, 0);

	mutex_init(&rtac_common.rtac_fops_mutex);



	/* ADM */

	memset(&rtac_adm_data, 0, sizeof(rtac_adm_data));
@@ -1885,7 +1872,6 @@ static int __init rtac_init(void) 
	init_waitqueue_head(&rtac_adm_apr_data.cmd_wait);

	mutex_init(&rtac_adm_mutex);

	mutex_init(&rtac_adm_apr_mutex);

	mutex_init(&rtac_adm_cal_mutex);



	rtac_adm_buffer = kzalloc(

		rtac_cal[ADM_RTAC_CAL].map_data.map_size, GFP_KERNEL);
@@ -1902,7 +1888,6 @@ static int __init rtac_init(void) 
		init_waitqueue_head(&rtac_asm_apr_data[i].cmd_wait);

	}

	mutex_init(&rtac_asm_apr_mutex);

	mutex_init(&rtac_asm_cal_mutex);



	rtac_asm_buffer = kzalloc(

		rtac_cal[ASM_RTAC_CAL].map_data.map_size, GFP_KERNEL);
@@ -1918,7 +1903,6 @@ static int __init rtac_init(void) 
	atomic_set(&rtac_afe_apr_data.cmd_state, 0);

	init_waitqueue_head(&rtac_afe_apr_data.cmd_wait);

	mutex_init(&rtac_afe_apr_mutex);

	mutex_init(&rtac_afe_cal_mutex);



	rtac_afe_buffer = kzalloc(

		rtac_cal[AFE_RTAC_CAL].map_data.map_size, GFP_KERNEL);
@@ -1939,7 +1923,6 @@ static int __init rtac_init(void) 
	}

	mutex_init(&rtac_voice_mutex);

	mutex_init(&rtac_voice_apr_mutex);

	mutex_init(&rtac_voice_cal_mutex);



	rtac_voice_buffer = kzalloc(

		rtac_cal[VOICE_RTAC_CAL].map_data.map_size, GFP_KERNEL);