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mm-video-v4l2: venc: Avoid buffer access after free

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am: 2cd0260b52

Change-Id: I534a3498295bfeceb2e4a8396bda24f48ece4a86
This commit is contained in:
Santhosh Behara 2017-10-10 19:38:02 +00:00 committed by android-build-merger
commit bf218371f6
3 changed files with 19 additions and 7 deletions
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1
msm8996/mm-video-v4l2/vidc/venc/inc/omx_video_base.h
View file

@ -677,6 +677,7 @@ class omx_video: public qc_omx_component
int pending_output_buffers;
uint64_t m_out_bm_count;
uint64_t m_client_out_bm_count;
uint64_t m_inp_bm_count;
uint64_t m_flags;
uint64_t m_etb_count;

18
msm8996/mm-video-v4l2/vidc/venc/src/omx_video_base.cpp
View file

@ -295,6 +295,7 @@ omx_video::omx_video():
pending_input_buffers(0),
pending_output_buffers(0),
m_out_bm_count(0),
m_client_out_bm_count(0),
m_inp_bm_count(0),
m_flags(0),
m_etb_count(0),
@ -2668,7 +2669,6 @@ OMX_ERRORTYPE omx_video::use_output_buffer(
return OMX_ErrorBadParameter;
}
auto_lock l(m_buf_lock);
if (!m_out_mem_ptr) {
output_use_buffer = true;
int nBufHdrSize = 0;
@ -2819,6 +2819,7 @@ OMX_ERRORTYPE omx_video::use_output_buffer(
}
BITMASK_SET(&m_out_bm_count,i);
BITMASK_SET(&m_client_out_bm_count,i);
} else {
DEBUG_PRINT_ERROR("ERROR: All o/p Buffers have been Used, invalid use_buf call for "
"index = %u", i);
@ -2856,6 +2857,8 @@ OMX_ERRORTYPE omx_video::use_buffer(
DEBUG_PRINT_ERROR("ERROR: Use Buffer in Invalid State");
return OMX_ErrorInvalidState;
}
auto_lock l(m_buf_lock);
if (port == PORT_INDEX_IN) {
eRet = use_input_buffer(hComp,bufferHdr,port,appData,bytes,buffer);
} else if (port == PORT_INDEX_OUT) {
@ -2927,7 +2930,6 @@ OMX_ERRORTYPE omx_video::free_input_buffer(OMX_BUFFERHEADERTYPE *bufferHdr)
}
if (index < m_sInPortDef.nBufferCountActual && m_pInput_pmem) {
auto_lock l(m_lock);
if (mUseProxyColorFormat) {
if (m_opq_pmem_q.m_size) {
@ -3447,7 +3449,7 @@ OMX_ERRORTYPE omx_video::allocate_buffer(OMX_IN OMX_HANDLETYPE h
DEBUG_PRINT_ERROR("ERROR: Allocate Buf in Invalid State");
return OMX_ErrorInvalidState;
}
auto_lock l(m_buf_lock);
// What if the client calls again.
if (port == PORT_INDEX_IN) {
#ifdef _ANDROID_ICS_
@ -3518,7 +3520,12 @@ OMX_ERRORTYPE omx_video::free_buffer(OMX_IN OMX_HANDLETYPE hComp,
unsigned int nPortIndex;
DEBUG_PRINT_LOW("In for encoder free_buffer");
auto_lock l(m_buf_lock);
if (port == PORT_INDEX_OUT) { //client called freebuffer, clearing client buffer bitmask right away to avoid use after free
nPortIndex = buffer - (OMX_BUFFERHEADERTYPE*)m_out_mem_ptr;
if(BITMASK_PRESENT(&m_client_out_bm_count, nPortIndex))
BITMASK_CLEAR(&m_client_out_bm_count,nPortIndex);
}
if (m_state == OMX_StateIdle &&
(BITMASK_PRESENT(&m_flags ,OMX_COMPONENT_LOADING_PENDING))) {
DEBUG_PRINT_LOW(" free buffer while Component in Loading pending");
@ -3595,7 +3602,6 @@ OMX_ERRORTYPE omx_video::free_buffer(OMX_IN OMX_HANDLETYPE hComp,
nPortIndex, (unsigned int)m_sOutPortDef.nBufferCountActual);
if (nPortIndex < m_sOutPortDef.nBufferCountActual &&
BITMASK_PRESENT(&m_out_bm_count, nPortIndex)) {
auto_lock l(m_buf_lock);
// Clear the bit associated with it.
BITMASK_CLEAR(&m_out_bm_count,nPortIndex);
m_sOutPortDef.bPopulated = OMX_FALSE;
@ -3856,7 +3862,7 @@ OMX_ERRORTYPE omx_video::empty_this_buffer_proxy(OMX_IN OMX_HANDLETYPE hComp,
{
DEBUG_PRINT_LOW("Heap UseBuffer case, so memcpy the data");
auto_lock l(m_lock);
auto_lock l(m_buf_lock);
pmem_data_buf = (OMX_U8 *)m_pInput_pmem[nBufIndex].buffer;
if (pmem_data_buf) {
memcpy (pmem_data_buf, (buffer->pBuffer + buffer->nOffset),

7
msm8996/mm-video-v4l2/vidc/venc/src/omx_video_encoder.cpp
View file

@ -2189,11 +2189,15 @@ OMX_ERRORTYPE omx_venc::component_deinit(OMX_IN OMX_HANDLETYPE hComp)
DEBUG_PRINT_ERROR("WARNING:Rxd DeInit,OMX not in LOADED state %d",\
m_state);
}
auto_lock l(m_buf_lock);
if (m_out_mem_ptr) {
DEBUG_PRINT_LOW("Freeing the Output Memory");
for (i=0; i< m_sOutPortDef.nBufferCountActual; i++ ) {
if (BITMASK_PRESENT(&m_out_bm_count, i)) {
BITMASK_CLEAR(&m_out_bm_count, i);
if (BITMASK_PRESENT(&m_client_out_bm_count, i))
BITMASK_CLEAR(&m_client_out_bm_count, i);
free_output_buffer (&m_out_mem_ptr[i]);
}
@ -2545,7 +2549,8 @@ int omx_venc::async_message_process (void *context, void* message)
omxhdr->nFlags = m_sVenc_msg->buf.flags;
/*Use buffer case*/
if (omx->output_use_buffer && !omx->m_use_output_pmem && !omx->is_secure_session()) {
if (BITMASK_PRESENT(&(omx->m_client_out_bm_count), bufIndex) &&
omx->output_use_buffer && !omx->m_use_output_pmem && !omx->is_secure_session()) {
DEBUG_PRINT_LOW("memcpy() for o/p Heap UseBuffer");
memcpy(omxhdr->pBuffer,
(m_sVenc_msg->buf.ptrbuffer),