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77 lines
2.9 KiB
Diff
77 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: Tue, 20 Dec 2022 22:48:23 +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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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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Merged-In: I937d22a2df26fca1d7f06b10182c4e713ddfed1b
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Change-Id: I937d22a2df26fca1d7f06b10182c4e713ddfed1b
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(cherry picked from commit 0846b5b746e844464fb728478fea3c2ad6aaef1f)
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Merged-In: I937d22a2df26fca1d7f06b10182c4e713ddfed1b
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---
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stack/sdp/sdp_db.c | 20 +++++++++++++++++---
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1 file changed, 17 insertions(+), 3 deletions(-)
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diff --git a/stack/sdp/sdp_db.c b/stack/sdp/sdp_db.c
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index b7f489770..e133d67cb 100644
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--- a/stack/sdp/sdp_db.c
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+++ b/stack/sdp/sdp_db.c
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@@ -406,6 +406,12 @@ BOOLEAN SDP_AddAttribute (UINT32 handle, UINT16 attr_id, UINT8 attr_type,
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UINT16 xx, yy, zz;
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tSDP_RECORD *p_rec = &sdp_cb.server_db.record[0];
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+ if (p_val == NULL)
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+ {
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+ SDP_TRACE_WARNING("Trying to add attribute with p_val == NULL, skipped");
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+ return (FALSE);
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+ }
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+
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#if (BT_TRACE_VERBOSE == TRUE)
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if (sdp_cb.trace_level >= BT_TRACE_LEVEL_DEBUG)
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{
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@@ -447,6 +453,14 @@ BOOLEAN SDP_AddAttribute (UINT32 handle, UINT16 attr_id, UINT8 attr_type,
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{
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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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+ {
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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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{
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@@ -493,15 +507,15 @@ BOOLEAN SDP_AddAttribute (UINT32 handle, UINT16 attr_id, UINT8 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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{
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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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}
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- else if ((attr_len == 0 && p_attr->len != 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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{
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SDP_TRACE_ERROR("SDP_AddAttribute fail, length exceed maximum: ID %d: attr_len:%d ",
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attr_id, attr_len );
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