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Date:      Wed, 5 Aug 2020 17:11:18 +0000 (UTC)
From:      Gordon Tetlow <gordon@FreeBSD.org>
To:        src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-releng@freebsd.org
Subject:   svn commit: r363921 - in releng: 11.3/sys/dev/usb/net 11.4/sys/dev/usb/net 12.1/sys/dev/usb/net
Message-ID:  <202008051711.075HBIgl096493@repo.freebsd.org>

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Author: gordon
Date: Wed Aug  5 17:11:18 2020
New Revision: 363921
URL: https://svnweb.freebsd.org/changeset/base/363921

Log:
  Fix memory corruption in USB network device drivers.
  
  Approved by:	so
  Security:	FreeBSD-SA-20:21.usb_net
  Security:	CVE-2020-7459

Modified:
  releng/11.3/sys/dev/usb/net/if_smsc.c
  releng/11.4/sys/dev/usb/net/if_smsc.c
  releng/12.1/sys/dev/usb/net/if_cdceem.c
  releng/12.1/sys/dev/usb/net/if_muge.c
  releng/12.1/sys/dev/usb/net/if_smsc.c

Modified: releng/11.3/sys/dev/usb/net/if_smsc.c
==============================================================================
--- releng/11.3/sys/dev/usb/net/if_smsc.c	Wed Aug  5 17:09:54 2020	(r363920)
+++ releng/11.3/sys/dev/usb/net/if_smsc.c	Wed Aug  5 17:11:18 2020	(r363921)
@@ -970,7 +970,7 @@ smsc_bulk_read_callback(struct usb_xfer *xfer, usb_err
 	struct mbuf *m;
 	struct usb_page_cache *pc;
 	uint32_t rxhdr;
-	uint16_t pktlen;
+	int pktlen;
 	int off;
 	int actlen;
 
@@ -996,6 +996,9 @@ smsc_bulk_read_callback(struct usb_xfer *xfer, usb_err
 			/* The frame header is always aligned on a 4 byte boundary */
 			off = ((off + 0x3) & ~0x3);
 
+			if ((off + sizeof(rxhdr)) > actlen)
+				goto tr_setup;
+
 			usbd_copy_out(pc, off, &rxhdr, sizeof(rxhdr));
 			off += (sizeof(rxhdr) + ETHER_ALIGN);
 			rxhdr = le32toh(rxhdr);
@@ -1024,7 +1027,13 @@ smsc_bulk_read_callback(struct usb_xfer *xfer, usb_err
 					if_inc_counter(ifp, IFCOUNTER_IQDROPS, 1);
 					goto tr_setup;
 				}
-				
+				if (pktlen > m->m_len) {
+					smsc_dbg_printf(sc, "buffer too small %d vs %d bytes",
+					    pktlen, m->m_len);
+					if_inc_counter(ifp, IFCOUNTER_IQDROPS, 1);
+					m_freem(m);
+					goto tr_setup;
+				}
 				usbd_copy_out(pc, off, mtod(m, uint8_t *), pktlen);
 
 				/* Check if RX TCP/UDP checksumming is being offloaded */

Modified: releng/11.4/sys/dev/usb/net/if_smsc.c
==============================================================================
--- releng/11.4/sys/dev/usb/net/if_smsc.c	Wed Aug  5 17:09:54 2020	(r363920)
+++ releng/11.4/sys/dev/usb/net/if_smsc.c	Wed Aug  5 17:11:18 2020	(r363921)
@@ -970,7 +970,7 @@ smsc_bulk_read_callback(struct usb_xfer *xfer, usb_err
 	struct mbuf *m;
 	struct usb_page_cache *pc;
 	uint32_t rxhdr;
-	uint16_t pktlen;
+	int pktlen;
 	int off;
 	int actlen;
 
@@ -996,6 +996,9 @@ smsc_bulk_read_callback(struct usb_xfer *xfer, usb_err
 			/* The frame header is always aligned on a 4 byte boundary */
 			off = ((off + 0x3) & ~0x3);
 
+			if ((off + sizeof(rxhdr)) > actlen)
+				goto tr_setup;
+
 			usbd_copy_out(pc, off, &rxhdr, sizeof(rxhdr));
 			off += (sizeof(rxhdr) + ETHER_ALIGN);
 			rxhdr = le32toh(rxhdr);
@@ -1024,7 +1027,13 @@ smsc_bulk_read_callback(struct usb_xfer *xfer, usb_err
 					if_inc_counter(ifp, IFCOUNTER_IQDROPS, 1);
 					goto tr_setup;
 				}
-				
+				if (pktlen > m->m_len) {
+					smsc_dbg_printf(sc, "buffer too small %d vs %d bytes",
+					    pktlen, m->m_len);
+					if_inc_counter(ifp, IFCOUNTER_IQDROPS, 1);
+					m_freem(m);
+					goto tr_setup;
+				}
 				usbd_copy_out(pc, off, mtod(m, uint8_t *), pktlen);
 
 				/* Check if RX TCP/UDP checksumming is being offloaded */

Modified: releng/12.1/sys/dev/usb/net/if_cdceem.c
==============================================================================
--- releng/12.1/sys/dev/usb/net/if_cdceem.c	Wed Aug  5 17:09:54 2020	(r363920)
+++ releng/12.1/sys/dev/usb/net/if_cdceem.c	Wed Aug  5 17:11:18 2020	(r363921)
@@ -426,9 +426,10 @@ cdceem_handle_data(struct usb_xfer *xfer, uint16_t hdr
 	struct usb_ether *ue;
 	struct ifnet *ifp;
 	struct mbuf *m;
-	int actlen, off;
 	uint32_t computed_crc, received_crc;
-	uint16_t pktlen;
+	int pktlen;
+	int actlen;
+	int off;
 
 	off = *offp;
 	sc = usbd_xfer_softc(xfer);
@@ -442,7 +443,7 @@ cdceem_handle_data(struct usb_xfer *xfer, uint16_t hdr
 	    (hdr & CDCEEM_DATA_CRC) ? "valid" : "absent",
 	    pktlen);
 
-	if (pktlen < ETHER_HDR_LEN) {
+	if (pktlen < (ETHER_HDR_LEN + 4)) {
 		CDCEEM_WARN(sc,
 		    "bad ethernet frame length %d, should be at least %d",
 		    pktlen, ETHER_HDR_LEN);
@@ -466,6 +467,14 @@ cdceem_handle_data(struct usb_xfer *xfer, uint16_t hdr
 	}
 
 	pktlen -= 4; /* Subtract the CRC. */
+
+	if (pktlen > m->m_len) {
+		CDCEEM_WARN(sc, "buffer too small %d vs %d bytes",
+		    pktlen, m->m_len);
+		if_inc_counter(ifp, IFCOUNTER_IQDROPS, 1);
+		m_freem(m);
+		return;
+	}
 	usbd_copy_out(pc, off, mtod(m, uint8_t *), pktlen);
 	off += pktlen;
 
@@ -512,7 +521,7 @@ cdceem_bulk_read_callback(struct usb_xfer *xfer, usb_e
 		pc = usbd_xfer_get_frame(xfer, 0);
 		off = 0;
 
-		while (off < actlen) {
+		while ((off + sizeof(hdr)) <= actlen) {
 			usbd_copy_out(pc, off, &hdr, sizeof(hdr));
 			CDCEEM_DEBUG(sc, "hdr = %#x", hdr);
 			off += sizeof(hdr);

Modified: releng/12.1/sys/dev/usb/net/if_muge.c
==============================================================================
--- releng/12.1/sys/dev/usb/net/if_muge.c	Wed Aug  5 17:09:54 2020	(r363920)
+++ releng/12.1/sys/dev/usb/net/if_muge.c	Wed Aug  5 17:11:18 2020	(r363921)
@@ -1167,9 +1167,9 @@ muge_bulk_read_callback(struct usb_xfer *xfer, usb_err
 	struct ifnet *ifp = uether_getifp(ue);
 	struct mbuf *m;
 	struct usb_page_cache *pc;
-	uint16_t pktlen;
 	uint32_t rx_cmd_a, rx_cmd_b;
 	uint16_t rx_cmd_c;
+	int pktlen;
 	int off;
 	int actlen;
 
@@ -1251,7 +1251,14 @@ muge_bulk_read_callback(struct usb_xfer *xfer, usb_err
 					    1);
 					goto tr_setup;
 				}
-
+				if (pktlen > m->m_len) {
+					muge_dbg_printf(sc,
+					    "buffer too small %d vs %d bytes",
+					    pktlen, m->m_len);
+					if_inc_counter(ifp, IFCOUNTER_IQDROPS, 1);
+					m_freem(m);
+					goto tr_setup;
+				}
 				usbd_copy_out(pc, off, mtod(m, uint8_t *),
 				    pktlen);
 

Modified: releng/12.1/sys/dev/usb/net/if_smsc.c
==============================================================================
--- releng/12.1/sys/dev/usb/net/if_smsc.c	Wed Aug  5 17:09:54 2020	(r363920)
+++ releng/12.1/sys/dev/usb/net/if_smsc.c	Wed Aug  5 17:11:18 2020	(r363921)
@@ -973,7 +973,7 @@ smsc_bulk_read_callback(struct usb_xfer *xfer, usb_err
 	struct mbuf *m;
 	struct usb_page_cache *pc;
 	uint32_t rxhdr;
-	uint16_t pktlen;
+	int pktlen;
 	int off;
 	int actlen;
 
@@ -999,6 +999,9 @@ smsc_bulk_read_callback(struct usb_xfer *xfer, usb_err
 			/* The frame header is always aligned on a 4 byte boundary */
 			off = ((off + 0x3) & ~0x3);
 
+			if ((off + sizeof(rxhdr)) > actlen)
+				goto tr_setup;
+
 			usbd_copy_out(pc, off, &rxhdr, sizeof(rxhdr));
 			off += (sizeof(rxhdr) + ETHER_ALIGN);
 			rxhdr = le32toh(rxhdr);
@@ -1027,7 +1030,13 @@ smsc_bulk_read_callback(struct usb_xfer *xfer, usb_err
 					if_inc_counter(ifp, IFCOUNTER_IQDROPS, 1);
 					goto tr_setup;
 				}
-				
+				if (pktlen > m->m_len) {
+					smsc_dbg_printf(sc, "buffer too small %d vs %d bytes",
+					    pktlen, m->m_len);
+					if_inc_counter(ifp, IFCOUNTER_IQDROPS, 1);
+					m_freem(m);
+					goto tr_setup;
+				}
 				usbd_copy_out(pc, off, mtod(m, uint8_t *), pktlen);
 
 				/* Check if RX TCP/UDP checksumming is being offloaded */



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