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https://github.com/Divested-Mobile/DivestOS-Build.git
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46 lines
1.4 KiB
Diff
46 lines
1.4 KiB
Diff
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From 818a7f04e004cae09ccd62e35911b9853a02b96b Mon Sep 17 00:00:00 2001
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From: George Chang <georgekgchang@google.com>
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Date: Tue, 9 Jul 2019 16:17:23 +0800
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Subject: [PATCH] Prevent OOB read in rw_t4t.cc part 2
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Bug: 120865977
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Bug: 120274615
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Bug: 124462242
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Test: Read T4T Tag
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Change-Id: I4d70537d71442205a9456c0ece7a836fa4473558
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---
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src/nfc/tags/rw_t4t.c | 13 +++++++++++++
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1 file changed, 13 insertions(+)
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diff --git a/src/nfc/tags/rw_t4t.c b/src/nfc/tags/rw_t4t.c
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index 7a7f457..29fbc02 100644
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--- a/src/nfc/tags/rw_t4t.c
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+++ b/src/nfc/tags/rw_t4t.c
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@@ -1075,6 +1075,8 @@ static void rw_t4t_handle_error (tNFC_STATUS status, UINT8 sw1, UINT8 sw2)
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rw_data.t4t_sw.sw1 = sw1;
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rw_data.t4t_sw.sw2 = sw2;
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+ rw_data.ndef.cur_size = 0;
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+ rw_data.ndef.max_size = 0;
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switch (p_t4t->state)
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{
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@@ -1980,6 +1982,17 @@ static void rw_t4t_data_cback (UINT8 conn_id, tNFC_CONN_EVT event, tNFC_CONN *p_
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RW_TRACE_DEBUG1 ("RW T4T state: %d", p_t4t->state);
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#endif
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+ if (p_t4t->state != RW_T4T_STATE_IDLE &&
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+ p_t4t->state != RW_T4T_STATE_PRESENCE_CHECK &&
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+ p_r_apdu->len < T4T_RSP_STATUS_WORDS_SIZE)
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+ {
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+ RW_TRACE_DEBUG1 ("%s incorrect p_r_apdu length", __func__);
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+ RW_TRACE_DEBUG0 ("0x534e4554 120865977");
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+ rw_t4t_handle_error(NFC_STATUS_FAILED, 0, 0);
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+ GKI_freebuf(p_r_apdu);
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+ return;
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+ }
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+
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switch (p_t4t->state)
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{
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case RW_T4T_STATE_IDLE:
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