smpp_smsc: Check that the size is large enough to hold actual data
The first 4 bytes are the length including the length field. For length < 4 the subsequent msgb_put(msg, sizeof(uint32_t)) will fail, resulting in an abort. The code also expects (in smpp_msgb_cmdid()) the existence of 4 more bytes for the SMPP command ID. This patch checks that the length received is large enough to hold all 8 bytes in the msgb and drops the connection if that's not the case. The issue is reproducible with: echo -e "\x00\x00\x00\x02\x00" |socat stdin tcp:localhost:2775
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@ -803,6 +803,12 @@ static int esme_link_read_cb(struct osmo_fd *ofd)
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if (esme->read_idx >= sizeof(uint32_t)) {
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esme->read_len = ntohl(len);
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if (esme->read_len < 8) {
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LOGP(DSMPP, LOGL_ERROR, "[%s] read length too small %u\n",
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esme->system_id, esme->read_len);
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goto dead_socket;
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}
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msg = msgb_alloc(esme->read_len, "SMPP Rx");
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if (!msg)
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return -ENOMEM;
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