From f42b03df24d3acd5caaa2628c206c591ccc023eb Mon Sep 17 00:00:00 2001
From: Ray Essick <essick@google.com>
Date: Mon, 2 Jul 2018 16:00:09 -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 sailfish/nyc-mr1-dev
Change-Id: Ic13b511b2d1c46e0b158880c41c9a02e2fefd113
Merged-In: Id699404d6c276c8702826d79b3a6ba9755b3439f
(cherry picked from commit 660db9e9708872f9a407ac14e92a5017599ced34)
---
 .../mm-video-v4l2/vidc/vdec/inc/omx_vdec.h    |  3 +-
 .../vidc/vdec/src/omx_vdec_v4l2.cpp           | 32 +++++++++++++++----
 2 files changed, 28 insertions(+), 7 deletions(-)

diff --git a/msm8996/mm-video-v4l2/vidc/vdec/inc/omx_vdec.h b/msm8996/mm-video-v4l2/vidc/vdec/inc/omx_vdec.h
index d400fc39e..f0958b166 100644
--- a/msm8996/mm-video-v4l2/vidc/vdec/inc/omx_vdec.h
+++ b/msm8996/mm-video-v4l2/vidc/vdec/inc/omx_vdec.h
@@ -1,5 +1,5 @@
 /*--------------------------------------------------------------------------
-Copyright (c) 2010 - 2016, The Linux Foundation. All rights reserved.
+Copyright (c) 2010 - 2016, 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
@@ -1173,6 +1173,7 @@ class omx_vdec: public qc_omx_component
         static OMX_ERRORTYPE describeColorFormat(OMX_PTR params);
         void prefetchNewBuffers();
 
+        bool m_buffer_error;
 };
 
 #ifdef _MSM8974_
diff --git a/msm8996/mm-video-v4l2/vidc/vdec/src/omx_vdec_v4l2.cpp b/msm8996/mm-video-v4l2/vidc/vdec/src/omx_vdec_v4l2.cpp
index 9d041e990..003cd9b56 100644
--- a/msm8996/mm-video-v4l2/vidc/vdec/src/omx_vdec_v4l2.cpp
+++ b/msm8996/mm-video-v4l2/vidc/vdec/src/omx_vdec_v4l2.cpp
@@ -1,5 +1,5 @@
 /*--------------------------------------------------------------------------
-Copyright (c) 2010 - 2016, The Linux Foundation. All rights reserved.
+Copyright (c) 2010 - 2016, 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:
@@ -647,7 +647,8 @@ omx_vdec::omx_vdec(): m_error_propogated(false),
     m_queued_codec_config_count(0),
     current_perf_level(V4L2_CID_MPEG_VIDC_PERF_LEVEL_NOMINAL),
     secure_scaling_to_non_secure_opb(false),
-    m_force_compressed_for_dpb(false)
+    m_force_compressed_for_dpb(false),
+    m_buffer_error(false)
 {
     m_pipe_in = -1;
     m_pipe_out = -1;
@@ -5525,6 +5526,7 @@ 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) {
@@ -5947,7 +5949,6 @@ 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) {
@@ -6156,6 +6157,7 @@ OMX_ERRORTYPE  omx_vdec::allocate_input_buffer(
     unsigned   i = 0;
     unsigned char *buf_addr = NULL;
     int pmem_fd = -1;
+    unsigned int align_size = 0;
 
     (void) hComp;
     (void) port;
@@ -6215,8 +6217,10 @@ 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 ?
                 SECURE_FLAGS_INPUT_BUFFER : ION_FLAG_CACHED);
@@ -6704,6 +6708,10 @@ 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 {
@@ -6764,6 +6772,7 @@ OMX_ERRORTYPE  omx_vdec::free_buffer(OMX_IN OMX_HANDLETYPE         hComp,
     (void) hComp;
     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");
@@ -6780,7 +6789,7 @@ OMX_ERRORTYPE  omx_vdec::free_buffer(OMX_IN OMX_HANDLETYPE         hComp,
         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");
@@ -6885,6 +6894,7 @@ OMX_ERRORTYPE  omx_vdec::free_buffer(OMX_IN OMX_HANDLETYPE         hComp,
             BITMASK_CLEAR((&m_flags),OMX_COMPONENT_LOADING_PENDING);
             post_event(OMX_CommandStateSet, OMX_StateLoaded,
                     OMX_COMPONENT_GENERATE_EVENT);
+            m_buffer_error = false;
         }
     }
     return eRet;
@@ -7054,6 +7064,11 @@ OMX_ERRORTYPE  omx_vdec::empty_this_buffer_proxy(OMX_IN OMX_HANDLETYPE  hComp,
     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 &&
@@ -7343,6 +7358,7 @@ 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) {
@@ -7351,6 +7367,10 @@ 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*/
@@ -8624,7 +8644,7 @@ int omx_vdec::async_message_process (void *context, void* message)
                     if (omxhdr && omxhdr->nFilledLen) {
                         omx->request_perf_level(VIDC_NOMINAL);
                     }
-                    if (omx->output_use_buffer && omxhdr->pBuffer &&
+                    if (!omx->m_enable_android_native_buffers && omx->output_use_buffer && omxhdr->pBuffer &&
                         vdec_msg->msgdata.output_frame.bufferaddr)
                         memcpy ( omxhdr->pBuffer, (void *)
                                 ((unsigned long)vdec_msg->msgdata.output_frame.bufferaddr +
