From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Santhosh Behara <santhoshbehara@codeaurora.org>
Date: Tue, 15 May 2018 06:09:50 -0700
Subject: [PATCH] mm-video-v4l2: Protect buffer access and increase input
 buffer size

Protect buffer access for below scenarios:

*Increase the scope of buf_lock in free_buffer to avoid access
 of freed buffer for both input and output buffers. Also, add check
 before output buffer access.

*Disallow allocate buffer mode after client has called use buffer.

Allocate additional 512 bytes of memory for input buffers on top of
allocation size as per hardware requirement.

Bug: 64340487
Test: ran POC on bullhead/nyc-dev
Change-Id: Iabbb2d7e00ff97bfc47b04386feec66976fca99a
(cherry picked from commit 83aeab22d1bdc493b3ea2f50616bb8fd460d6c74)
---
 mm-video-v4l2/vidc/vdec/inc/omx_vdec.h        |  3 +-
 .../vidc/vdec/src/omx_vdec_msm8974.cpp        | 33 +++++++++++++++----
 2 files changed, 28 insertions(+), 8 deletions(-)

diff --git a/mm-video-v4l2/vidc/vdec/inc/omx_vdec.h b/mm-video-v4l2/vidc/vdec/inc/omx_vdec.h
index 9b01376d5..07cbcc772 100644
--- a/mm-video-v4l2/vidc/vdec/inc/omx_vdec.h
+++ b/mm-video-v4l2/vidc/vdec/inc/omx_vdec.h
@@ -1,5 +1,5 @@
 /*--------------------------------------------------------------------------
-Copyright (c) 2010 - 2014, The Linux Foundation. All rights reserved.
+Copyright (c) 2010 - 2014, 2018, The Linux Foundation. All rights reserved.
 
   Redistribution and use in source and binary forms, with or without
   modification, are permitted provided that the following conditions
@@ -1066,6 +1066,7 @@ class omx_vdec: public qc_omx_component
         }
 
         static OMX_ERRORTYPE describeColorFormat(OMX_PTR params);
+        bool m_buffer_error;
 };
 
 #ifdef _MSM8974_
diff --git a/mm-video-v4l2/vidc/vdec/src/omx_vdec_msm8974.cpp b/mm-video-v4l2/vidc/vdec/src/omx_vdec_msm8974.cpp
index ccfb8c2d2..b887b72bd 100644
--- a/mm-video-v4l2/vidc/vdec/src/omx_vdec_msm8974.cpp
+++ b/mm-video-v4l2/vidc/vdec/src/omx_vdec_msm8974.cpp
@@ -1,5 +1,5 @@
 /*--------------------------------------------------------------------------
-Copyright (c) 2010 - 2014, The Linux Foundation. All rights reserved.
+Copyright (c) 2010 - 2014, 2018, The Linux Foundation. All rights reserved.
 
 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions are met:
@@ -574,7 +574,8 @@ omx_vdec::omx_vdec(): m_error_propogated(false),
     m_profile(0),
     client_set_fps(false),
     m_last_rendered_TS(-1),
-    m_queued_codec_config_count(0)
+    m_queued_codec_config_count(0),
+    m_buffer_error(false)
 {
     /* Assumption is that , to begin with , we have all the frames with decoder */
     DEBUG_PRINT_HIGH("In OMX vdec Constructor");
@@ -4490,6 +4491,7 @@ OMX_ERRORTYPE  omx_vdec::use_output_buffer(
         eRet = allocate_output_headers();
         if (eRet == OMX_ErrorNone)
             eRet = allocate_extradata();
+        output_use_buffer = true;
     }
 
     if (eRet == OMX_ErrorNone) {
@@ -4892,7 +4894,6 @@ OMX_ERRORTYPE omx_vdec::free_input_buffer(OMX_BUFFERHEADERTYPE *bufferHdr)
     index = bufferHdr - m_inp_mem_ptr;
     DEBUG_PRINT_LOW("Free Input Buffer index = %d",index);
 
-    auto_lock l(buf_lock);
     bufferHdr->pInputPortPrivate = NULL;
 
     if (index < drv_ctx.ip_buf.actualcount && drv_ctx.ptr_inputbuffer) {
@@ -5102,6 +5103,7 @@ OMX_ERRORTYPE  omx_vdec::allocate_input_buffer(
     unsigned   i = 0;
     unsigned char *buf_addr = NULL;
     int pmem_fd = -1;
+    unsigned int align_size = 0;
 
     if (bytes != drv_ctx.ip_buf.buffer_size) {
         DEBUG_PRINT_LOW("Requested Size is wrong %lu epected is %d",
@@ -5157,8 +5159,10 @@ OMX_ERRORTYPE  omx_vdec::allocate_input_buffer(
         int rc;
         DEBUG_PRINT_LOW("Allocate input Buffer");
 #ifdef USE_ION
+        align_size = drv_ctx.ip_buf.buffer_size + 512;
+        align_size = (align_size + drv_ctx.ip_buf.alignment - 1)&(~(drv_ctx.ip_buf.alignment - 1));
         drv_ctx.ip_buf_ion_info[i].ion_device_fd = alloc_map_ion_memory(
-                drv_ctx.ip_buf.buffer_size,drv_ctx.op_buf.alignment,
+                align_size, drv_ctx.op_buf.alignment,
                 &drv_ctx.ip_buf_ion_info[i].ion_alloc_data,
                 &drv_ctx.ip_buf_ion_info[i].fd_ion_data, secure_mode ? ION_SECURE : 0);
         if (drv_ctx.ip_buf_ion_info[i].ion_device_fd < 0) {
@@ -5639,6 +5643,10 @@ OMX_ERRORTYPE  omx_vdec::allocate_buffer(OMX_IN OMX_HANDLETYPE                hC
             eRet = allocate_input_buffer(hComp,bufferHdr,port,appData,bytes);
         }
     } else if (port == OMX_CORE_OUTPUT_PORT_INDEX) {
+        if (output_use_buffer) {
+            DEBUG_PRINT_ERROR("Allocate output buffer not allowed after use buffer");
+            return OMX_ErrorBadParameter;
+        }
         eRet = client_buffers.allocate_buffers_color_convert(hComp,bufferHdr,port,
                 appData,bytes);
     } else {
@@ -5698,6 +5706,7 @@ OMX_ERRORTYPE  omx_vdec::free_buffer(OMX_IN OMX_HANDLETYPE         hComp __unuse
     unsigned int nPortIndex;
     DEBUG_PRINT_LOW("In for decoder free_buffer");
 
+    auto_lock l(buf_lock);
     if (m_state == OMX_StateIdle &&
             (BITMASK_PRESENT(&m_flags ,OMX_COMPONENT_LOADING_PENDING))) {
         DEBUG_PRINT_LOW(" free buffer while Component in Loading pending");
@@ -5714,7 +5723,7 @@ OMX_ERRORTYPE  omx_vdec::free_buffer(OMX_IN OMX_HANDLETYPE         hComp __unuse
         post_event(OMX_EventError,
                 OMX_ErrorPortUnpopulated,
                 OMX_COMPONENT_GENERATE_EVENT);
-
+        m_buffer_error = true;
         return OMX_ErrorIncorrectStateOperation;
     } else if (m_state != OMX_StateInvalid) {
         DEBUG_PRINT_ERROR("Invalid state to free buffer,port lost Buffers");
@@ -5722,7 +5731,6 @@ OMX_ERRORTYPE  omx_vdec::free_buffer(OMX_IN OMX_HANDLETYPE         hComp __unuse
                 OMX_ErrorPortUnpopulated,
                 OMX_COMPONENT_GENERATE_EVENT);
     }
-
     if (port == OMX_CORE_INPUT_PORT_INDEX) {
         /*Check if arbitrary bytes*/
         if (!arbitrary_bytes && !input_use_buffer)
@@ -5819,6 +5827,7 @@ OMX_ERRORTYPE  omx_vdec::free_buffer(OMX_IN OMX_HANDLETYPE         hComp __unuse
             BITMASK_CLEAR((&m_flags),OMX_COMPONENT_LOADING_PENDING);
             post_event(OMX_CommandStateSet, OMX_StateLoaded,
                     OMX_COMPONENT_GENERATE_EVENT);
+            m_buffer_error = false;
         }
     }
     return eRet;
@@ -5982,6 +5991,11 @@ OMX_ERRORTYPE  omx_vdec::empty_this_buffer_proxy(OMX_IN OMX_HANDLETYPE         h
     if (!temp_buffer || (temp_buffer -  drv_ctx.ptr_inputbuffer) > (int)drv_ctx.ip_buf.actualcount) {
         return OMX_ErrorBadParameter;
     }
+
+    if (BITMASK_ABSENT(&m_inp_bm_count, nPortIndex) || m_buffer_error) {
+        DEBUG_PRINT_ERROR("ETBProxy: ERROR: invalid buffer, nPortIndex %u", nPortIndex);
+        return OMX_ErrorBadParameter;
+    }
     /* If its first frame, H264 codec and reject is true, then parse the nal
        and get the profile. Based on this, reject the clip playback */
     if (first_frame == 0 && codec_type_parse == CODEC_TYPE_H264 &&
@@ -6268,6 +6282,7 @@ OMX_ERRORTYPE  omx_vdec::fill_this_buffer_proxy(
     struct vdec_bufferpayload     *ptr_outputbuffer = NULL;
     struct vdec_output_frameinfo  *ptr_respbuffer = NULL;
 
+    auto_lock l(buf_lock);
     nPortIndex = buffer-((OMX_BUFFERHEADERTYPE *)client_buffers.get_il_buf_hdr());
 
     if (bufferAdd == NULL || nPortIndex >= drv_ctx.op_buf.actualcount) {
@@ -6276,6 +6291,10 @@ OMX_ERRORTYPE  omx_vdec::fill_this_buffer_proxy(
         return OMX_ErrorBadParameter;
     }
 
+    if (BITMASK_ABSENT(&m_out_bm_count, nPortIndex) || m_buffer_error) {
+        DEBUG_PRINT_ERROR("FTBProxy: ERROR: invalid buffer, nPortIndex %u", nPortIndex);
+        return OMX_ErrorBadParameter;
+    }
     DEBUG_PRINT_LOW("FTBProxy: bufhdr = %p, bufhdr->pBuffer = %p",
             bufferAdd, bufferAdd->pBuffer);
     /*Return back the output buffer to client*/
@@ -7417,7 +7436,7 @@ int omx_vdec::async_message_process (void *context, void* message)
                         output_respbuf->pic_type = PICTURE_TYPE_B;
                     }
 
-                    if (omx->output_use_buffer)
+                    if (!omx->m_enable_android_native_buffers && omx->output_use_buffer)
                         memcpy ( omxhdr->pBuffer, (void *)
                                 ((unsigned long)vdec_msg->msgdata.output_frame.bufferaddr +
                                  (unsigned long)vdec_msg->msgdata.output_frame.offset),
