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