mirror of
https://github.com/Divested-Mobile/DivestOS-Build.git
synced 2024-10-01 01:35:54 -04:00
76 lines
2.9 KiB
Diff
76 lines
2.9 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
|
|
From: Hui Peng <phui@google.com>
|
|
Date: Wed, 4 Jan 2023 22:45:13 +0000
|
|
Subject: [PATCH] Fix an OOB write in SDP_AddAttribute
|
|
|
|
When the `attr_pad` becomes full, it is possible
|
|
that un index of `-1` is computed write
|
|
a zero byte to `p_val`, rusulting OOB write.
|
|
|
|
```
|
|
p_val[SDP_MAX_PAD_LEN - p_rec->free_pad_ptr - 1] = '\0';
|
|
```
|
|
|
|
This is a backport of I937d22a2df26fca1d7f06b10182c4e713ddfed1b
|
|
|
|
Bug: 261867748
|
|
Test: manual
|
|
Tag: #security
|
|
Ignore-AOSP-First: security
|
|
Change-Id: Ibdda754e628cfc9d1706c14db114919a15d8d6b1
|
|
(cherry picked from commit cc527a97f78a2999a0156a579e488afe9e3675b2)
|
|
Merged-In: Ibdda754e628cfc9d1706c14db114919a15d8d6b1
|
|
---
|
|
stack/sdp/sdp_db.cc | 20 +++++++++++++++-----
|
|
1 file changed, 15 insertions(+), 5 deletions(-)
|
|
|
|
diff --git a/stack/sdp/sdp_db.cc b/stack/sdp/sdp_db.cc
|
|
index d215260e9..8d5eb4073 100644
|
|
--- a/stack/sdp/sdp_db.cc
|
|
+++ b/stack/sdp/sdp_db.cc
|
|
@@ -362,6 +362,11 @@ bool SDP_AddAttribute(uint32_t handle, uint16_t attr_id, uint8_t attr_type,
|
|
uint16_t xx, yy, zz;
|
|
tSDP_RECORD* p_rec = &sdp_cb.server_db.record[0];
|
|
|
|
+ if (p_val == nullptr) {
|
|
+ SDP_TRACE_WARNING("Trying to add attribute with p_val == nullptr, skipped");
|
|
+ return (false);
|
|
+ }
|
|
+
|
|
if (sdp_cb.trace_level >= BT_TRACE_LEVEL_DEBUG) {
|
|
if ((attr_type == UINT_DESC_TYPE) ||
|
|
(attr_type == TWO_COMP_INT_DESC_TYPE) ||
|
|
@@ -398,6 +403,13 @@ bool SDP_AddAttribute(uint32_t handle, uint16_t attr_id, uint8_t attr_type,
|
|
if (p_rec->record_handle == handle) {
|
|
tSDP_ATTRIBUTE* p_attr = &p_rec->attribute[0];
|
|
|
|
+ // error out early, no need to look up
|
|
+ if (p_rec->free_pad_ptr >= SDP_MAX_PAD_LEN) {
|
|
+ SDP_TRACE_ERROR("the free pad for SDP record with handle %d is "
|
|
+ "full, skip adding the attribute", handle);
|
|
+ return (false);
|
|
+ }
|
|
+
|
|
/* Found the record. Now, see if the attribute already exists */
|
|
for (xx = 0; xx < p_rec->num_attributes; xx++, p_attr++) {
|
|
/* The attribute exists. replace it */
|
|
@@ -437,15 +449,13 @@ bool SDP_AddAttribute(uint32_t handle, uint16_t attr_id, uint8_t attr_type,
|
|
attr_len = 0;
|
|
}
|
|
|
|
- if ((attr_len > 0) && (p_val != 0)) {
|
|
+ if (attr_len > 0) {
|
|
p_attr->len = attr_len;
|
|
memcpy(&p_rec->attr_pad[p_rec->free_pad_ptr], p_val, (size_t)attr_len);
|
|
p_attr->value_ptr = &p_rec->attr_pad[p_rec->free_pad_ptr];
|
|
p_rec->free_pad_ptr += attr_len;
|
|
- } else if ((attr_len == 0 &&
|
|
- p_attr->len !=
|
|
- 0) || /* if truncate to 0 length, simply don't add */
|
|
- p_val == 0) {
|
|
+ } else if (attr_len == 0 && p_attr->len != 0) {
|
|
+ /* if truncate to 0 length, simply don't add */
|
|
SDP_TRACE_ERROR(
|
|
"SDP_AddAttribute fail, length exceed maximum: ID %d: attr_len:%d ",
|
|
attr_id, attr_len);
|