CVE-2023-44488 (published 2023-09-30T20:15Z)

VP9 in libvpx before 1.13.1 mishandles widths, leading to a crash related to encoding.

CVSS v3 base score: 7.5, HIGH (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)

Weakness information:
cwe_id: CWE-755
cwe_name: Improper Handling of Exceptional Conditions
description: The product does not handle or incorrectly handles an exceptional condition.
extended_description: 
            
         
         

Fix information:
repo_url: https://github.com/webmproject/libvpx
commit_details: repo_url: https://github.com/webmproject/libvpx
author: Jerome Jiang
author_date: 2022-06-30 13:48:56-04:00
msg: Fix bug with smaller width bigger size

Fixed previous patch that clusterfuzz failed on.

Local fuzzing passing overnight.

Bug: webm:1642
Change-Id: If0e08e72abd2e042efe4dcfac21e4cc51afdfdb9
(cherry picked from commit 263682c9a29395055f3b3afe2d97be1828a6223f)
repository: repo_url: https://github.com/webmproject/libvpx
repo_name: webmproject/libvpx
description: Mirror only. Please do not send pull requests.
repo_language: C
owner: webmproject
file_changes: filename: resize_test.cc
change_type: ModificationType.MODIFY
diff: @@ -102,11 +102,8 @@ void ScaleForFrameNumber(unsigned int frame, unsigned int initial_w,
     if (frame < 30) {
       return;
     }
-    if (frame < 100) {
-      *w = initial_w * 7 / 10;
-      *h = initial_h * 16 / 10;
-      return;
-    }
+    *w = initial_w * 7 / 10;
+    *h = initial_h * 16 / 10;
     return;
   }
   if (frame < 10) {
@@ -559,9 +556,7 @@ TEST_P(ResizeRealtimeTest, TestExternalResizeWorks) {
   }
 }
 
-// TODO(https://crbug.com/webm/1642): This causes a segfault in
-// init_encode_frame_mb_context().
-TEST_P(ResizeRealtimeTest, DISABLED_TestExternalResizeSmallerWidthBiggerSize) {
+TEST_P(ResizeRealtimeTest, TestExternalResizeSmallerWidthBiggerSize) {
   ResizingVideoSource video;
   video.flag_codec_ = true;
   video.smaller_width_larger_size_ = true;

programming_language: C++
filename: vp9_alloccommon.c
change_type: ModificationType.MODIFY
diff: @@ -135,13 +135,6 @@ int vp9_alloc_context_buffers(VP9_COMMON *cm, int width, int height) {
     cm->free_mi(cm);
     if (cm->alloc_mi(cm, new_mi_size)) goto fail;
   }
-
-  if (cm->seg_map_alloc_size < cm->mi_rows * cm->mi_cols) {
-    // Create the segmentation map structure and set to 0.
-    free_seg_map(cm);
-    if (alloc_seg_map(cm, cm->mi_rows * cm->mi_cols)) goto fail;
-  }
-
   if (cm->above_context_alloc_cols < cm->mi_cols) {
     vpx_free(cm->above_context);
     cm->above_context = (ENTROPY_CONTEXT *)vpx_calloc(
@@ -156,6 +149,12 @@ int vp9_alloc_context_buffers(VP9_COMMON *cm, int width, int height) {
     cm->above_context_alloc_cols = cm->mi_cols;
   }
 
+  if (cm->seg_map_alloc_size < cm->mi_rows * cm->mi_cols) {
+    // Create the segmentation map structure and set to 0.
+    free_seg_map(cm);
+    if (alloc_seg_map(cm, cm->mi_rows * cm->mi_cols)) goto fail;
+  }
+
   if (vp9_alloc_loop_filter(cm)) goto fail;
 
   return 0;

programming_language: C
filename: vp9_encoder.c
change_type: ModificationType.MODIFY
diff: @@ -1973,6 +1973,17 @@ static void alloc_copy_partition_data(VP9_COMP *cpi) {
   }
 }
 
+static void free_copy_partition_data(VP9_COMP *cpi) {
+  vpx_free(cpi->prev_partition);
+  cpi->prev_partition = NULL;
+  vpx_free(cpi->prev_segment_id);
+  cpi->prev_segment_id = NULL;
+  vpx_free(cpi->prev_variance_low);
+  cpi->prev_variance_low = NULL;
+  vpx_free(cpi->copied_frame_cnt);
+  cpi->copied_frame_cnt = NULL;
+}
+
 void vp9_change_config(struct VP9_COMP *cpi, const VP9EncoderConfig *oxcf) {
   VP9_COMMON *const cm = &cpi->common;
   RATE_CONTROL *const rc = &cpi->rc;
@@ -2052,6 +2063,8 @@ void vp9_change_config(struct VP9_COMP *cpi, const VP9EncoderConfig *oxcf) {
     new_mi_size = cm->mi_stride * calc_mi_size(cm->mi_rows);
     if (cm->mi_alloc_size < new_mi_size) {
       vp9_free_context_buffers(cm);
+      vp9_free_pc_tree(&cpi->td);
+      vpx_free(cpi->mbmi_ext_base);
       alloc_compressor_data(cpi);
       realloc_segmentation_maps(cpi);
       cpi->initial_width = cpi->initial_height = 0;
@@ -2070,8 +2083,18 @@ void vp9_change_config(struct VP9_COMP *cpi, const VP9EncoderConfig *oxcf) {
     update_frame_size(cpi);
 
   if (last_w != cpi->oxcf.width || last_h != cpi->oxcf.height) {
-    memset(cpi->consec_zero_mv, 0,
-           cm->mi_rows * cm->mi_cols * sizeof(*cpi->consec_zero_mv));
+    vpx_free(cpi->consec_zero_mv);
+    CHECK_MEM_ERROR(
+        cm, cpi->consec_zero_mv,
+        vpx_calloc(cm->mi_rows * cm->mi_cols, sizeof(*cpi->consec_zero_mv)));
+
+    vpx_free(cpi->skin_map);
+    CHECK_MEM_ERROR(
+        cm, cpi->skin_map,
+        vpx_calloc(cm->mi_rows * cm->mi_cols, sizeof(cpi->skin_map[0])));
+
+    free_copy_partition_data(cpi);
+    alloc_copy_partition_data(cpi);
     if (cpi->oxcf.aq_mode == CYCLIC_REFRESH_AQ)
       vp9_cyclic_refresh_reset_resize(cpi);
     rc->rc_1_frame = 0;

programming_language: C
repo_url: https://github.com/webmproject/libvpx
commit_details: repo_url: https://github.com/webmproject/libvpx
author: Jerome Jiang
author_date: 2022-06-30 13:48:56-04:00
msg: Fix bug with smaller width bigger size

Fixed previous patch that clusterfuzz failed on.

Bug: webm:1642
Change-Id: If0e08e72abd2e042efe4dcfac21e4cc51afdfdb9
repository: repo_url: https://github.com/webmproject/libvpx
repo_name: webmproject/libvpx
description: Mirror only. Please do not send pull requests.
repo_language: C
owner: webmproject
file_changes: filename: resize_test.cc
change_type: ModificationType.MODIFY
diff: @@ -102,11 +102,8 @@ void ScaleForFrameNumber(unsigned int frame, unsigned int initial_w,
     if (frame < 30) {
       return;
     }
-    if (frame < 100) {
-      *w = initial_w * 7 / 10;
-      *h = initial_h * 16 / 10;
-      return;
-    }
+    *w = initial_w * 7 / 10;
+    *h = initial_h * 16 / 10;
     return;
   }
   if (frame < 10) {
@@ -559,9 +556,7 @@ TEST_P(ResizeRealtimeTest, TestExternalResizeWorks) {
   }
 }
 
-// TODO(https://crbug.com/webm/1642): This causes a segfault in
-// init_encode_frame_mb_context().
-TEST_P(ResizeRealtimeTest, DISABLED_TestExternalResizeSmallerWidthBiggerSize) {
+TEST_P(ResizeRealtimeTest, TestExternalResizeSmallerWidthBiggerSize) {
   ResizingVideoSource video;
   video.flag_codec_ = true;
   video.smaller_width_larger_size_ = true;

programming_language: C++
filename: vp9_alloccommon.c
change_type: ModificationType.MODIFY
diff: @@ -135,13 +135,6 @@ int vp9_alloc_context_buffers(VP9_COMMON *cm, int width, int height) {
     cm->free_mi(cm);
     if (cm->alloc_mi(cm, new_mi_size)) goto fail;
   }
-
-  if (cm->seg_map_alloc_size < cm->mi_rows * cm->mi_cols) {
-    // Create the segmentation map structure and set to 0.
-    free_seg_map(cm);
-    if (alloc_seg_map(cm, cm->mi_rows * cm->mi_cols)) goto fail;
-  }
-
   if (cm->above_context_alloc_cols < cm->mi_cols) {
     vpx_free(cm->above_context);
     cm->above_context = (ENTROPY_CONTEXT *)vpx_calloc(
@@ -156,6 +149,12 @@ int vp9_alloc_context_buffers(VP9_COMMON *cm, int width, int height) {
     cm->above_context_alloc_cols = cm->mi_cols;
   }
 
+  if (cm->seg_map_alloc_size < cm->mi_rows * cm->mi_cols) {
+    // Create the segmentation map structure and set to 0.
+    free_seg_map(cm);
+    if (alloc_seg_map(cm, cm->mi_rows * cm->mi_cols)) goto fail;
+  }
+
   if (vp9_alloc_loop_filter(cm)) goto fail;
 
   return 0;

programming_language: C
filename: vp9_encoder.c
change_type: ModificationType.MODIFY
diff: @@ -2047,6 +2047,17 @@ static void alloc_copy_partition_data(VP9_COMP *cpi) {
   }
 }
 
+static void free_copy_partition_data(VP9_COMP *cpi) {
+  vpx_free(cpi->prev_partition);
+  cpi->prev_partition = NULL;
+  vpx_free(cpi->prev_segment_id);
+  cpi->prev_segment_id = NULL;
+  vpx_free(cpi->prev_variance_low);
+  cpi->prev_variance_low = NULL;
+  vpx_free(cpi->copied_frame_cnt);
+  cpi->copied_frame_cnt = NULL;
+}
+
 void vp9_change_config(struct VP9_COMP *cpi, const VP9EncoderConfig *oxcf) {
   VP9_COMMON *const cm = &cpi->common;
   RATE_CONTROL *const rc = &cpi->rc;
@@ -2126,6 +2137,8 @@ void vp9_change_config(struct VP9_COMP *cpi, const VP9EncoderConfig *oxcf) {
     new_mi_size = cm->mi_stride * calc_mi_size(cm->mi_rows);
     if (cm->mi_alloc_size < new_mi_size) {
       vp9_free_context_buffers(cm);
+      vp9_free_pc_tree(&cpi->td);
+      vpx_free(cpi->mbmi_ext_base);
       alloc_compressor_data(cpi);
       realloc_segmentation_maps(cpi);
       cpi->initial_width = cpi->initial_height = 0;
@@ -2144,8 +2157,18 @@ void vp9_change_config(struct VP9_COMP *cpi, const VP9EncoderConfig *oxcf) {
     update_frame_size(cpi);
 
   if (last_w != cpi->oxcf.width || last_h != cpi->oxcf.height) {
-    memset(cpi->consec_zero_mv, 0,
-           cm->mi_rows * cm->mi_cols * sizeof(*cpi->consec_zero_mv));
+    vpx_free(cpi->consec_zero_mv);
+    CHECK_MEM_ERROR(
+        &cm->error, cpi->consec_zero_mv,
+        vpx_calloc(cm->mi_rows * cm->mi_cols, sizeof(*cpi->consec_zero_mv)));
+
+    vpx_free(cpi->skin_map);
+    CHECK_MEM_ERROR(
+        &cm->error, cpi->skin_map,
+        vpx_calloc(cm->mi_rows * cm->mi_cols, sizeof(cpi->skin_map[0])));
+
+    free_copy_partition_data(cpi);
+    alloc_copy_partition_data(cpi);
     if (cpi->oxcf.aq_mode == CYCLIC_REFRESH_AQ)
       vp9_cyclic_refresh_reset_resize(cpi);
     rc->rc_1_frame = 0;

programming_language: C