:::::: :::::: Manual check reason: "low confidence bisect report" :::::: Manual check reason: "low confidence static check warning: kernel/bpf/net.c:35:14: warning: use of uninitialized value '<unknown>' [CWE-457] [-Wanalyzer-use-of-uninitialized-value]" ::::::
CC: [email protected] BCC: [email protected] CC: Daniel Borkmann <[email protected]> CC: [email protected] TO: Daniel Borkmann <[email protected]> tree: https://github.com/cilium/linux.git pr/meta5 head: 7033821ae5e03647290a224e76b72fe98a45ab07 commit: fafe94e50da7d56dd12f94a7bf97a0e3a9dda12d [4/7] bpf: Add initial fd-based API to attach tc BPF programs :::::: branch date: 12 hours ago :::::: commit date: 16 hours ago config: arm-randconfig-c002-20220722 (https://download.01.org/0day-ci/archive/20220723/[email protected]/config) 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://github.com/cilium/linux/commit/fafe94e50da7d56dd12f94a7bf97a0e3a9dda12d git remote add cilium https://github.com/cilium/linux.git git fetch --no-tags cilium pr/meta5 git checkout fafe94e50da7d56dd12f94a7bf97a0e3a9dda12d # save the config file ARCH=arm KBUILD_USERCFLAGS='-fanalyzer -Wno-error' If you fix the issue, kindly add following tag where applicable Reported-by: kernel test robot <[email protected]> gcc-analyzer warnings: (new ones prefixed by >>) kernel/bpf/net.c: In function '__sch_prog_attach': >> kernel/bpf/net.c:35:14: warning: use of uninitialized value '<unknown>' >> [CWE-457] [-Wanalyzer-use-of-uninitialized-value] 35 | bool created; | ^~~~~~~ '__sch_prog_attach': event 1 | | 35 | bool created; | | ^~~~~~~ | | | | | (1) use of uninitialized value '<unknown>' here | kernel/bpf/net.c: In function '__sch_prog_query': kernel/bpf/net.c:226:27: warning: use of uninitialized value '<unknown>' [CWE-457] [-Wanalyzer-use-of-uninitialized-value] 226 | u32 i, flags = 0, cnt; | ^~~ '__sch_prog_query': event 1 | | 226 | u32 i, flags = 0, cnt; | | ^~~ | | | | | (1) use of uninitialized value '<unknown>' here | vim +35 kernel/bpf/net.c fafe94e50da7d5 Daniel Borkmann 2022-06-13 28 fafe94e50da7d5 Daniel Borkmann 2022-06-13 29 static int __sch_prog_attach(struct net_device *dev, bool ingress, u32 limit, fafe94e50da7d5 Daniel Borkmann 2022-06-13 30 struct bpf_prog *nprog, u32 prio, u32 flags) fafe94e50da7d5 Daniel Borkmann 2022-06-13 31 { fafe94e50da7d5 Daniel Borkmann 2022-06-13 32 struct bpf_prog_array_item *item, *tmp; fafe94e50da7d5 Daniel Borkmann 2022-06-13 33 struct sch_entry *entry, *peer; fafe94e50da7d5 Daniel Borkmann 2022-06-13 34 struct bpf_prog *oprog; fafe94e50da7d5 Daniel Borkmann 2022-06-13 @35 bool created; fafe94e50da7d5 Daniel Borkmann 2022-06-13 36 int i, j; fafe94e50da7d5 Daniel Borkmann 2022-06-13 37 fafe94e50da7d5 Daniel Borkmann 2022-06-13 38 entry = dev_sch_entry_fetch(dev, ingress, &created); fafe94e50da7d5 Daniel Borkmann 2022-06-13 39 if (!entry) fafe94e50da7d5 Daniel Borkmann 2022-06-13 40 return -ENOMEM; fafe94e50da7d5 Daniel Borkmann 2022-06-13 41 for (i = 0; i < limit; i++) { fafe94e50da7d5 Daniel Borkmann 2022-06-13 42 item = &entry->items[i]; fafe94e50da7d5 Daniel Borkmann 2022-06-13 43 oprog = item->prog; fafe94e50da7d5 Daniel Borkmann 2022-06-13 44 if (!oprog) fafe94e50da7d5 Daniel Borkmann 2022-06-13 45 break; fafe94e50da7d5 Daniel Borkmann 2022-06-13 46 if (item->bpf_priority == prio) { fafe94e50da7d5 Daniel Borkmann 2022-06-13 47 if (flags & BPF_F_REPLACE) { fafe94e50da7d5 Daniel Borkmann 2022-06-13 48 /* Pairs with READ_ONCE() in sch_run_progs(). */ fafe94e50da7d5 Daniel Borkmann 2022-06-13 49 WRITE_ONCE(item->prog, nprog); fafe94e50da7d5 Daniel Borkmann 2022-06-13 50 if (sch_prog_refcounted(oprog)) fafe94e50da7d5 Daniel Borkmann 2022-06-13 51 bpf_prog_put(oprog); fafe94e50da7d5 Daniel Borkmann 2022-06-13 52 dev_sch_entry_prio_set(entry, prio, nprog); fafe94e50da7d5 Daniel Borkmann 2022-06-13 53 return prio; fafe94e50da7d5 Daniel Borkmann 2022-06-13 54 } fafe94e50da7d5 Daniel Borkmann 2022-06-13 55 return -EBUSY; fafe94e50da7d5 Daniel Borkmann 2022-06-13 56 } fafe94e50da7d5 Daniel Borkmann 2022-06-13 57 } fafe94e50da7d5 Daniel Borkmann 2022-06-13 58 if (dev_sch_entry_total(entry) >= limit) fafe94e50da7d5 Daniel Borkmann 2022-06-13 59 return -ENOSPC; fafe94e50da7d5 Daniel Borkmann 2022-06-13 60 prio = dev_sch_entry_prio_new(entry, prio, nprog); fafe94e50da7d5 Daniel Borkmann 2022-06-13 61 if (prio < 0) { fafe94e50da7d5 Daniel Borkmann 2022-06-13 62 if (created) fafe94e50da7d5 Daniel Borkmann 2022-06-13 63 dev_sch_entry_free(entry); fafe94e50da7d5 Daniel Borkmann 2022-06-13 64 return -ENOMEM; fafe94e50da7d5 Daniel Borkmann 2022-06-13 65 } fafe94e50da7d5 Daniel Borkmann 2022-06-13 66 peer = dev_sch_entry_peer(entry); fafe94e50da7d5 Daniel Borkmann 2022-06-13 67 dev_sch_entry_clear(peer); fafe94e50da7d5 Daniel Borkmann 2022-06-13 68 for (i = 0, j = 0; i < limit; i++, j++) { fafe94e50da7d5 Daniel Borkmann 2022-06-13 69 item = &entry->items[i]; fafe94e50da7d5 Daniel Borkmann 2022-06-13 70 tmp = &peer->items[j]; fafe94e50da7d5 Daniel Borkmann 2022-06-13 71 oprog = item->prog; fafe94e50da7d5 Daniel Borkmann 2022-06-13 72 if (!oprog) { fafe94e50da7d5 Daniel Borkmann 2022-06-13 73 if (i == j) { fafe94e50da7d5 Daniel Borkmann 2022-06-13 74 tmp->prog = nprog; fafe94e50da7d5 Daniel Borkmann 2022-06-13 75 tmp->bpf_priority = prio; fafe94e50da7d5 Daniel Borkmann 2022-06-13 76 } fafe94e50da7d5 Daniel Borkmann 2022-06-13 77 break; fafe94e50da7d5 Daniel Borkmann 2022-06-13 78 } else if (item->bpf_priority < prio) { fafe94e50da7d5 Daniel Borkmann 2022-06-13 79 tmp->prog = oprog; fafe94e50da7d5 Daniel Borkmann 2022-06-13 80 tmp->bpf_priority = item->bpf_priority; fafe94e50da7d5 Daniel Borkmann 2022-06-13 81 } else if (item->bpf_priority > prio) { fafe94e50da7d5 Daniel Borkmann 2022-06-13 82 if (i == j) { fafe94e50da7d5 Daniel Borkmann 2022-06-13 83 tmp->prog = nprog; fafe94e50da7d5 Daniel Borkmann 2022-06-13 84 tmp->bpf_priority = prio; fafe94e50da7d5 Daniel Borkmann 2022-06-13 85 tmp = &peer->items[++j]; fafe94e50da7d5 Daniel Borkmann 2022-06-13 86 } fafe94e50da7d5 Daniel Borkmann 2022-06-13 87 tmp->prog = oprog; fafe94e50da7d5 Daniel Borkmann 2022-06-13 88 tmp->bpf_priority = item->bpf_priority; fafe94e50da7d5 Daniel Borkmann 2022-06-13 89 } fafe94e50da7d5 Daniel Borkmann 2022-06-13 90 } fafe94e50da7d5 Daniel Borkmann 2022-06-13 91 dev_sch_entry_update(dev, peer, ingress); fafe94e50da7d5 Daniel Borkmann 2022-06-13 92 if (ingress) fafe94e50da7d5 Daniel Borkmann 2022-06-13 93 net_inc_ingress_queue(); fafe94e50da7d5 Daniel Borkmann 2022-06-13 94 else fafe94e50da7d5 Daniel Borkmann 2022-06-13 95 net_inc_egress_queue(); fafe94e50da7d5 Daniel Borkmann 2022-06-13 96 return prio; fafe94e50da7d5 Daniel Borkmann 2022-06-13 97 } fafe94e50da7d5 Daniel Borkmann 2022-06-13 98 -- 0-DAY CI Kernel Test Service https://01.org/lkp _______________________________________________ kbuild mailing list -- [email protected] To unsubscribe send an email to [email protected]
