[kbuild] net/mctp/test/route-test.c:296:24: warning: use of uninitialized value '<unknown>' [CWE-457]

:::::: :::::: Manual check reason: "low confidence bisect report" :::::: Manual check reason: "low confidence static check warning: net/mctp/test/route-test.c:296:24: warning: use of uninitialized value '<unknown>' [CWE-457] [-Wanalyzer-use-of-uninitialized-value]" :::::: BCC: lkp(a)intel.com CC: kbuild-all(a)lists.01.org CC: linux-kernel(a)vger.kernel.org TO: Jeremy Kerr <jk(a)codeconstruct.com.au&gt; tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 38eddeedbbeac33f26845c29e7414b9313ea70db commit: 8892c0490779d6de921eb684e5504708fdbbcb68 mctp: Add route input to socket tests date: 12 months ago :::::: branch date: 5 hours ago :::::: commit date: 12 months ago config: arm-randconfig-c002-20220916 (https://download.01.org/0day-ci/archive/20220919/202209190559.LWdQ4f6Z-lk...) compiler: arm-linux-gnueabi-gcc (GCC) 12.1.0 reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit... git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout 8892c0490779d6de921eb684e5504708fdbbcb68 # save the config file COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross ARCH=arm KBUILD_USERCFLAGS='-fanalyzer -Wno-error' If you fix the issue, kindly add following tag where applicable Reported-by: kernel test robot <lkp(a)intel.com&gt; gcc_analyzer warnings: (new ones prefixed by >>) | | ~~~~~~~~~~~~~~~ | | | | | (22) calling 'skb_orphan' from 'mctp_route_input' | +--> 'skb_orphan': events 23-25 | |include/linux/skbuff.h:2781:20: | 2781 | static inline void skb_orphan(struct sk_buff *skb) | | ^~~~~~~~~~ | | | | | (23) entry to 'skb_orphan' | 2782 | { | 2783 | if (skb->destructor) { | | ~ | | | | | (24) following 'true' branch... | 2784 | skb->destructor(skb); | | ~~~~~~~~~~~~~~~~~~~~ | | | | | (25) ...to here | <------+ | 'mctp_route_input': events 26-27 | |net/mctp/route.c:278:9: | 278 | skb_orphan(skb); | | ^~~~~~~~~~~~~~~ | | | | | (26) returning to 'mctp_route_input' from 'skb_orphan' |...... | 281 | if (skb->len < sizeof(struct mctp_hdr) + 1) | | ~~~~~~~~ | | | | | (27) dereference of NULL 'skb' | net/mctp/route.c: In function 'mctp_newroute': net/mctp/route.c:1039:20: warning: use of uninitialized value '<unknown>' [CWE-457] [-Wanalyzer-use-of-uninitialized-value] 1039 | mctp_eid_t daddr_start; | ^~~~~~~~~~~ 'mctp_newroute': event 1 | | 1039 | mctp_eid_t daddr_start; | | ^~~~~~~~~~~ | | | | | (1) use of uninitialized value '<unknown>' here | net/mctp/route.c:1040:26: warning: use of uninitialized value '<unknown>' [CWE-457] [-Wanalyzer-use-of-uninitialized-value] 1040 | struct mctp_dev *mdev; | ^~~~ 'mctp_newroute': event 1 | | 1040 | struct mctp_dev *mdev; | | ^~~~ | | | | | (1) use of uninitialized value '<unknown>' here | net/mctp/route.c:1041:23: warning: use of uninitialized value '<unknown>' [CWE-457] [-Wanalyzer-use-of-uninitialized-value] 1041 | struct rtmsg *rtm; | ^~~ 'mctp_newroute': event 1 | | 1041 | struct rtmsg *rtm; | | ^~~ | | | | | (1) use of uninitialized value '<unknown>' here | net/mctp/route.c: In function 'mctp_delroute': net/mctp/route.c:1077:20: warning: use of uninitialized value '<unknown>' [CWE-457] [-Wanalyzer-use-of-uninitialized-value] 1077 | mctp_eid_t daddr_start; | ^~~~~~~~~~~ 'mctp_delroute': event 1 | | 1077 | mctp_eid_t daddr_start; | | ^~~~~~~~~~~ | | | | | (1) use of uninitialized value '<unknown>' here | net/mctp/route.c:1078:26: warning: use of uninitialized value '<unknown>' [CWE-457] [-Wanalyzer-use-of-uninitialized-value] 1078 | struct mctp_dev *mdev; | ^~~~ 'mctp_delroute': event 1 | | 1078 | struct mctp_dev *mdev; | | ^~~~ | | | | | (1) use of uninitialized value '<unknown>' here | net/mctp/route.c:1079:23: warning: use of uninitialized value '<unknown>' [CWE-457] [-Wanalyzer-use-of-uninitialized-value] 1079 | struct rtmsg *rtm; | ^~~ 'mctp_delroute': event 1 | | 1079 | struct rtmsg *rtm; | | ^~~ | | | | | (1) use of uninitialized value '<unknown>' here | In file included from net/mctp/route.c:1234: net/mctp/test/route-test.c: In function '__mctp_route_test_init': 296 | struct socket *sock; | ^~~~ '__mctp_route_test_init': event 1 | | 296 | struct socket *sock; | | ^~~~ | | | | | (1) use of uninitialized value '<unknown>' here | net/mctp/test/route-test.c: In function 'mctp_test_route_input_sk': net/mctp/test/route-test.c:340:33: warning: use of uninitialized value '<unknown>' [CWE-457] [-Wanalyzer-use-of-uninitialized-value] 340 | struct mctp_test_route *rt; | ^~ 'mctp_test_route_input_sk': event 1 | | 340 | struct mctp_test_route *rt; | | ^~ | | | | | (1) use of uninitialized value '<unknown>' here | net/mctp/test/route-test.c:341:31: warning: use of uninitialized value '<unknown>' [CWE-457] [-Wanalyzer-use-of-uninitialized-value] 341 | struct mctp_test_dev *dev; | ^~~ 'mctp_test_route_input_sk': event 1 | | 341 | struct mctp_test_dev *dev; | | ^~~ | | | | | (1) use of uninitialized value '<unknown>' here | net/mctp/test/route-test.c:342:24: warning: use of uninitialized value '<unknown>' [CWE-457] [-Wanalyzer-use-of-uninitialized-value] 342 | struct socket *sock; | ^~~~ 'mctp_test_route_input_sk': event 1 | | 342 | struct socket *sock; | | ^~~~ | | | | | (1) use of uninitialized value '<unknown>' here | net/mctp/test/route-test.c:343:13: warning: use of uninitialized value '<unknown>' [CWE-457] [-Wanalyzer-use-of-uninitialized-value] 343 | int rc; | ^~ 'mctp_test_route_input_sk': event 1 | | 343 | int rc; | | ^~ | | | | | (1) use of uninitialized value '<unknown>' here | In file included from net/mctp/test/route-test.c:3: include/kunit/test.h:866:22: warning: dereference of NULL 'skb' [CWE-476] [-Wanalyzer-null-dereference] 866 | typeof(left) __left = (left); \ | ^~~~~~ include/kunit/test.h:891:9: note: in expansion of macro 'KUNIT_BASE_BINARY_ASSERTION' 891 | KUNIT_BASE_BINARY_ASSERTION(test, \ | ^~~~~~~~~~~~~~~~~~~~~~~~~~~ include/kunit/test.h:980:9: note: in expansion of macro 'KUNIT_BASE_EQ_MSG_ASSERTION' 980 | KUNIT_BASE_EQ_MSG_ASSERTION(test, \ | ^~~~~~~~~~~~~~~~~~~~~~~~~~~ include/kunit/test.h:990:9: note: in expansion of macro 'KUNIT_BINARY_EQ_MSG_ASSERTION' 990 | KUNIT_BINARY_EQ_MSG_ASSERTION(test, \ | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/kunit/test.h:1353:9: note: in expansion of macro 'KUNIT_BINARY_EQ_ASSERTION' 1353 | KUNIT_BINARY_EQ_ASSERTION(test, KUNIT_EXPECTATION, left, right) | ^~~~~~~~~~~~~~~~~~~~~~~~~ net/mctp/test/route-test.c:362:17: note: in expansion of macro 'KUNIT_EXPECT_EQ' 362 | KUNIT_EXPECT_EQ(test, skb->len, 1); | ^~~~~~~~~~~~~~~ 'mctp_test_route_input_sk': events 1-2 | | 336 | static void mctp_test_route_input_sk(struct kunit *test) | | ^~~~~~~~~~~~~~~~~~~~~~~~ | | | | | (1) entry to 'mctp_test_route_input_sk' |...... | 347 | __mctp_route_test_init(test, &dev, &rt, &sock); | | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | | | | | (2) calling '__mctp_route_test_init' from 'mctp_test_route_input_sk' | +--> '__mctp_route_test_init': events 3-4 | | 288 | static void __mctp_route_test_init(struct kunit *test, | | ^~~~~~~~~~~~~~~~~~~~~~ | | | | | (3) entry to '__mctp_route_test_init' |...... | 302 | rt = mctp_test_create_route(&init_net, dev->mdev, 8, 68); | | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | | | | | (4) calling 'mctp_test_create_route' from '__mctp_route_test_init' | +--> 'mctp_test_create_route': events 5-6 | | 39 | static struct mctp_test_route *mctp_test_create_route(struct net *net, | | ^~~~~~~~~~~~~~~~~~~~~~ | | | | | (5) entry to 'mctp_test_create_route' |...... vim +296 net/mctp/test/route-test.c b504db408c34e0 Jeremy Kerr 2021-10-03 283 b504db408c34e0 Jeremy Kerr 2021-10-03 284 KUNIT_ARRAY_PARAM(mctp_rx_input, mctp_rx_input_tests, b504db408c34e0 Jeremy Kerr 2021-10-03 285 mctp_rx_input_test_to_desc); b504db408c34e0 Jeremy Kerr 2021-10-03 286 8892c0490779d6 Jeremy Kerr 2021-10-03 287 /* set up a local dev, route on EID 8, and a socket listening on type 0 */ 8892c0490779d6 Jeremy Kerr 2021-10-03 288 static void __mctp_route_test_init(struct kunit *test, 8892c0490779d6 Jeremy Kerr 2021-10-03 289 struct mctp_test_dev **devp, 8892c0490779d6 Jeremy Kerr 2021-10-03 290 struct mctp_test_route **rtp, 8892c0490779d6 Jeremy Kerr 2021-10-03 291 struct socket **sockp) 8892c0490779d6 Jeremy Kerr 2021-10-03 292 { 8892c0490779d6 Jeremy Kerr 2021-10-03 293 struct sockaddr_mctp addr; 8892c0490779d6 Jeremy Kerr 2021-10-03 294 struct mctp_test_route *rt; 8892c0490779d6 Jeremy Kerr 2021-10-03 295 struct mctp_test_dev *dev; 8892c0490779d6 Jeremy Kerr 2021-10-03 @296 struct socket *sock; 8892c0490779d6 Jeremy Kerr 2021-10-03 297 int rc; 8892c0490779d6 Jeremy Kerr 2021-10-03 298 8892c0490779d6 Jeremy Kerr 2021-10-03 299 dev = mctp_test_create_dev(); 8892c0490779d6 Jeremy Kerr 2021-10-03 300 KUNIT_ASSERT_NOT_ERR_OR_NULL(test, dev); 8892c0490779d6 Jeremy Kerr 2021-10-03 301 8892c0490779d6 Jeremy Kerr 2021-10-03 302 rt = mctp_test_create_route(&init_net, dev->mdev, 8, 68); 8892c0490779d6 Jeremy Kerr 2021-10-03 303 KUNIT_ASSERT_NOT_ERR_OR_NULL(test, rt); 8892c0490779d6 Jeremy Kerr 2021-10-03 304 8892c0490779d6 Jeremy Kerr 2021-10-03 305 rc = sock_create_kern(&init_net, AF_MCTP, SOCK_DGRAM, 0, &sock); 8892c0490779d6 Jeremy Kerr 2021-10-03 306 KUNIT_ASSERT_EQ(test, rc, 0); 8892c0490779d6 Jeremy Kerr 2021-10-03 307 8892c0490779d6 Jeremy Kerr 2021-10-03 308 addr.smctp_family = AF_MCTP; 8892c0490779d6 Jeremy Kerr 2021-10-03 309 addr.smctp_network = MCTP_NET_ANY; 8892c0490779d6 Jeremy Kerr 2021-10-03 310 addr.smctp_addr.s_addr = 8; 8892c0490779d6 Jeremy Kerr 2021-10-03 311 addr.smctp_type = 0; 8892c0490779d6 Jeremy Kerr 2021-10-03 312 rc = kernel_bind(sock, (struct sockaddr *)&addr, sizeof(addr)); 8892c0490779d6 Jeremy Kerr 2021-10-03 313 KUNIT_ASSERT_EQ(test, rc, 0); 8892c0490779d6 Jeremy Kerr 2021-10-03 314 8892c0490779d6 Jeremy Kerr 2021-10-03 315 *rtp = rt; 8892c0490779d6 Jeremy Kerr 2021-10-03 316 *devp = dev; 8892c0490779d6 Jeremy Kerr 2021-10-03 317 *sockp = sock; 8892c0490779d6 Jeremy Kerr 2021-10-03 318 } 8892c0490779d6 Jeremy Kerr 2021-10-03 319 -- 0-DAY CI Kernel Test Service https://01.org/lkp