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<a id="changeset-link" style="font-size:14px;font-weight:600;color:#0068FF;font-size: 14px; color: #0068FF; font-weight: 600;" href="https://github.com/ovsrobot/ovs/commit/0c932cb79280">0c932cb CHANGESET →</a>
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<p id="commit-message" style="margin:0px;font-family:cousine, monospace;font-size:14px;line-height:22px;font-family: cousine, monospace; font-size: 14px; text-align: left; line-height: 22px;">ovsdb-cs: Fix use-after-free for the request id.<br><br>ovsdb_cs_send_transaction() returns the pointer to the same<br>'request_id' object that is used internally. This leads to<br>situation where transaction in idl and CS module has the<br>same 'request_id' object. However, CS module is able to<br>destroy this transaction id at any time, e.g. if connection<br>state chnaged, but idl transaction might be still around at<br>this moment and application might still use it.<br><br>Found by running 'make check-ovsdb-cluster' with AddressSanitizer:<br><br> ==79922==ERROR: AddressSanitizer: heap-use-after-free on address<br> 0x604000167a98 at pc 0x000000626acf bp 0x7ffcdb38a4c0 sp 0x7ffcdb38a4b8<br> READ of size 8 at 0x604000167a98 thread T0<br> #0 0x626ace in json_destroy lib/json.c:354:18<br> #1 0x56d1ab in ovsdb_idl_txn_destroy lib/ovsdb-idl.c:2528:5<br> #2 0x53a908 in do_vsctl utilities/ovs-vsctl.c:3008:5<br> #3 0x539251 in main utilities/ovs-vsctl.c:203:17<br> #4 0x7f7f7e376081 in __libc_start_main (/lib64/libc.so.6+0x27081)<br> #5 0x461fed in _start (utilities/ovs-vsctl+0x461fed)<br><br> 0x604000167a98 is located 8 bytes inside of 40-byte<br> region [0x604000167a90,0x604000167ab8)<br> freed by thread T0 here:<br> #0 0x503ac7 in free (utilities/ovs-vsctl+0x503ac7)<br> #1 0x626aae in json_destroy lib/json.c:378:9<br> #2 0x6adfa2 in ovsdb_cs_run lib/ovsdb-cs.c:625:13<br> #3 0x567731 in ovsdb_idl_run lib/ovsdb-idl.c:394:5<br> #4 0x56fed1 in ovsdb_idl_txn_commit_block lib/ovsdb-idl.c:3187:9<br> #5 0x53a4df in do_vsctl utilities/ovs-vsctl.c:2898:14<br> #6 0x539251 in main utilities/ovs-vsctl.c:203:17<br> #7 0x7f7f7e376081 in __libc_start_main<br><br> previously allocated by thread T0 here:<br> #0 0x503dcf in malloc (utilities/ovs-vsctl+0x503dcf)<br> #1 0x594656 in xmalloc lib/util.c:138:15<br> #2 0x626431 in json_create lib/json.c:1451:25<br> #3 0x626972 in json_integer_create lib/json.c:263:25<br> #4 0x62da0f in jsonrpc_create_id lib/jsonrpc.c:563:12<br> #5 0x62d9a8 in jsonrpc_create_request lib/jsonrpc.c:570:23<br> #6 0x6af3a6 in ovsdb_cs_send_transaction lib/ovsdb-cs.c:1357:35<br> #7 0x56e3d5 in ovsdb_idl_txn_commit lib/ovsdb-idl.c:3147:27<br> #8 0x56fea9 in ovsdb_idl_txn_commit_block lib/ovsdb-idl.c:3186:22<br> #9 0x53a4df in do_vsctl utilities/ovs-vsctl.c:2898:14<br> #10 0x539251 in main utilities/ovs-vsctl.c:203:17<br> #11 0x7f7f7e376081 in __libc_start_main<br><br>Fixes: 1c337c43ac1c ("ovsdb-idl: Break into two layers.")<br>Signed-off-by: Ilya Maximets <i.maximets@ovn.org><br>Signed-off-by: 0-day Robot <robot@bytheb.org></p>
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