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52 lines
2.2 KiB
Diff
52 lines
2.2 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Brian Delwiche <delwiche@google.com>
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Date: Mon, 22 Apr 2024 16:43:29 +0000
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Subject: [PATCH] Fix heap-buffer overflow in sdp_utils.cc
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Fuzzer identifies a case where sdpu_compare_uuid_with_attr crashes with
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an out of bounds comparison. Although the bug claims this is due to a
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comparison of a uuid with a smaller data field thana the discovery
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attribute, my research suggests that this instead stems from a
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comparison of a 128 bit UUID with a discovery attribute of some other,
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invalid size.
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Add checks for discovery attribute size.
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Bug: 287184435
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Test: atest bluetooth_test_gd_unit, net_test_stack_sdp
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Tag: #security
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Ignore-AOSP-First: Security
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(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:99210e2f251e2189c1eede15942c832e017404c2)
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Merged-In: Ib536cbeac454efbf6af3d713c05c8e3e077e069b
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Change-Id: Ib536cbeac454efbf6af3d713c05c8e3e077e069b
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---
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stack/sdp/sdp_utils.c | 9 ++++++++-
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1 file changed, 8 insertions(+), 1 deletion(-)
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diff --git a/stack/sdp/sdp_utils.c b/stack/sdp/sdp_utils.c
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index e9df46068..d1dd94e13 100644
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--- a/stack/sdp/sdp_utils.c
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+++ b/stack/sdp/sdp_utils.c
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@@ -850,13 +850,20 @@ BOOLEAN sdpu_compare_uuid_with_attr (tBT_UUID *p_btuuid, tSDP_DISC_ATTR *p_attr)
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UINT16 attr_len = SDP_DISC_ATTR_LEN (p_attr->attr_len_type);
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/* Since both UUIDs are compressed, lengths must match */
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- if (p_btuuid->len != attr_len)
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+ if (p_btuuid->len != attr_len) {
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+ SDP_TRACE_ERROR("invalid length for discovery attribute");
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return (FALSE);
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+ }
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if (p_btuuid->len == 2)
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return (BOOLEAN)(p_btuuid->uu.uuid16 == p_attr->attr_value.v.u16);
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else if (p_btuuid->len == 4)
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return (BOOLEAN)(p_btuuid->uu.uuid32 == p_attr->attr_value.v.u32);
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+ else if (attr_len != MAX_UUID_SIZE) {
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+ SDP_TRACE_ERROR("invalid length for discovery attribute");
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+ return (FALSE);
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+ }
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+
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/* coverity[overrun-buffer-arg] */
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/*
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Event overrun-buffer-arg: Overrun of static array "&p_attr->attr_value.v.array" of size 4 bytes by passing it to a function which indexes it with argument "16U" at byte position 15
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