CC: [email protected] CC: [email protected] TO: Coly Li <[email protected]>
tree: https://git.kernel.org/pub/scm/linux/kernel/git/colyli/linux-bcache.git nvdimm-meta head: a12f8ec824edd1317f14882c7d0aee5e5c941edd commit: 5f408d113974d2bb3eb1b237d549724f7509ab23 [11/12] bcache: read jset from NVDIMM pages for journal replay :::::: branch date: 8 hours ago :::::: commit date: 8 hours ago config: x86_64-randconfig-m001-20210804 (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <[email protected]> Reported-by: Dan Carpenter <[email protected]> smatch warnings: drivers/md/bcache/journal.c:114 journal_read_bucket() error: potentially dereferencing uninitialized 'j'. vim +/j +114 drivers/md/bcache/journal.c cafe563591446c Kent Overstreet 2013-03-23 106 cafe563591446c Kent Overstreet 2013-03-23 107 /* This function could be simpler now since we no longer write cafe563591446c Kent Overstreet 2013-03-23 108 * journal entries that overlap bucket boundaries; this means cafe563591446c Kent Overstreet 2013-03-23 109 * the start of a bucket will always have a valid journal entry cafe563591446c Kent Overstreet 2013-03-23 110 * if it has any journal entries at all. cafe563591446c Kent Overstreet 2013-03-23 111 */ cafe563591446c Kent Overstreet 2013-03-23 112 while (len) { cafe563591446c Kent Overstreet 2013-03-23 113 struct list_head *where; cafe563591446c Kent Overstreet 2013-03-23 @114 size_t blocks, bytes = set_bytes(j); cafe563591446c Kent Overstreet 2013-03-23 115 b3fa7e77e67e64 Kent Overstreet 2013-08-05 116 if (j->magic != jset_magic(&ca->sb)) { 46f5aa8806e34f Joe Perches 2020-05-27 117 pr_debug("%u: bad magic\n", bucket_index); cafe563591446c Kent Overstreet 2013-03-23 118 return ret; b3fa7e77e67e64 Kent Overstreet 2013-08-05 119 } cafe563591446c Kent Overstreet 2013-03-23 120 b3fa7e77e67e64 Kent Overstreet 2013-08-05 121 if (bytes > left << 9 || b3fa7e77e67e64 Kent Overstreet 2013-08-05 122 bytes > PAGE_SIZE << JSET_BITS) { 46f5aa8806e34f Joe Perches 2020-05-27 123 pr_info("%u: too big, %zu bytes, offset %u\n", b3fa7e77e67e64 Kent Overstreet 2013-08-05 124 bucket_index, bytes, offset); cafe563591446c Kent Overstreet 2013-03-23 125 return ret; b3fa7e77e67e64 Kent Overstreet 2013-08-05 126 } cafe563591446c Kent Overstreet 2013-03-23 127 cafe563591446c Kent Overstreet 2013-03-23 128 if (bytes > len << 9) cafe563591446c Kent Overstreet 2013-03-23 129 goto reread; cafe563591446c Kent Overstreet 2013-03-23 130 b3fa7e77e67e64 Kent Overstreet 2013-08-05 131 if (j->csum != csum_set(j)) { 46f5aa8806e34f Joe Perches 2020-05-27 132 pr_info("%u: bad csum, %zu bytes, offset %u\n", b3fa7e77e67e64 Kent Overstreet 2013-08-05 133 bucket_index, bytes, offset); cafe563591446c Kent Overstreet 2013-03-23 134 return ret; b3fa7e77e67e64 Kent Overstreet 2013-08-05 135 } cafe563591446c Kent Overstreet 2013-03-23 136 4e1ebae3ee4e0c Coly Li 2020-10-01 137 blocks = set_blocks(j, block_bytes(ca)); cafe563591446c Kent Overstreet 2013-03-23 138 2464b693148e5d Coly Li 2019-06-28 139 /* 2464b693148e5d Coly Li 2019-06-28 140 * Nodes in 'list' are in linear increasing order of 2464b693148e5d Coly Li 2019-06-28 141 * i->j.seq, the node on head has the smallest (oldest) 2464b693148e5d Coly Li 2019-06-28 142 * journal seq, the node on tail has the biggest 2464b693148e5d Coly Li 2019-06-28 143 * (latest) journal seq. 2464b693148e5d Coly Li 2019-06-28 144 */ 2464b693148e5d Coly Li 2019-06-28 145 2464b693148e5d Coly Li 2019-06-28 146 /* 2464b693148e5d Coly Li 2019-06-28 147 * Check from the oldest jset for last_seq. If 2464b693148e5d Coly Li 2019-06-28 148 * i->j.seq < j->last_seq, it means the oldest jset 2464b693148e5d Coly Li 2019-06-28 149 * in list is expired and useless, remove it from 9c9b81c45619e7 Bhaskar Chowdhury 2021-04-11 150 * this list. Otherwise, j is a candidate jset for 2464b693148e5d Coly Li 2019-06-28 151 * further following checks. 2464b693148e5d Coly Li 2019-06-28 152 */ cafe563591446c Kent Overstreet 2013-03-23 153 while (!list_empty(list)) { cafe563591446c Kent Overstreet 2013-03-23 154 i = list_first_entry(list, cafe563591446c Kent Overstreet 2013-03-23 155 struct journal_replay, list); cafe563591446c Kent Overstreet 2013-03-23 156 if (i->j.seq >= j->last_seq) cafe563591446c Kent Overstreet 2013-03-23 157 break; cafe563591446c Kent Overstreet 2013-03-23 158 list_del(&i->list); cafe563591446c Kent Overstreet 2013-03-23 159 kfree(i); cafe563591446c Kent Overstreet 2013-03-23 160 } cafe563591446c Kent Overstreet 2013-03-23 161 2464b693148e5d Coly Li 2019-06-28 162 /* iterate list in reverse order (from latest jset) */ cafe563591446c Kent Overstreet 2013-03-23 163 list_for_each_entry_reverse(i, list, list) { cafe563591446c Kent Overstreet 2013-03-23 164 if (j->seq == i->j.seq) cafe563591446c Kent Overstreet 2013-03-23 165 goto next_set; cafe563591446c Kent Overstreet 2013-03-23 166 2464b693148e5d Coly Li 2019-06-28 167 /* 2464b693148e5d Coly Li 2019-06-28 168 * if j->seq is less than any i->j.last_seq 2464b693148e5d Coly Li 2019-06-28 169 * in list, j is an expired and useless jset. 2464b693148e5d Coly Li 2019-06-28 170 */ cafe563591446c Kent Overstreet 2013-03-23 171 if (j->seq < i->j.last_seq) cafe563591446c Kent Overstreet 2013-03-23 172 goto next_set; cafe563591446c Kent Overstreet 2013-03-23 173 2464b693148e5d Coly Li 2019-06-28 174 /* 2464b693148e5d Coly Li 2019-06-28 175 * 'where' points to first jset in list which 2464b693148e5d Coly Li 2019-06-28 176 * is elder then j. 2464b693148e5d Coly Li 2019-06-28 177 */ cafe563591446c Kent Overstreet 2013-03-23 178 if (j->seq > i->j.seq) { cafe563591446c Kent Overstreet 2013-03-23 179 where = &i->list; cafe563591446c Kent Overstreet 2013-03-23 180 goto add; cafe563591446c Kent Overstreet 2013-03-23 181 } cafe563591446c Kent Overstreet 2013-03-23 182 } cafe563591446c Kent Overstreet 2013-03-23 183 cafe563591446c Kent Overstreet 2013-03-23 184 where = list; cafe563591446c Kent Overstreet 2013-03-23 185 add: cafe563591446c Kent Overstreet 2013-03-23 186 i = kmalloc(offsetof(struct journal_replay, j) + cafe563591446c Kent Overstreet 2013-03-23 187 bytes, GFP_KERNEL); cafe563591446c Kent Overstreet 2013-03-23 188 if (!i) cafe563591446c Kent Overstreet 2013-03-23 189 return -ENOMEM; cafe563591446c Kent Overstreet 2013-03-23 190 memcpy(&i->j, j, bytes); 2464b693148e5d Coly Li 2019-06-28 191 /* Add to the location after 'where' points to */ cafe563591446c Kent Overstreet 2013-03-23 192 list_add(&i->list, where); cafe563591446c Kent Overstreet 2013-03-23 193 ret = 1; cafe563591446c Kent Overstreet 2013-03-23 194 a231f07a5fe30a Coly Li 2019-06-28 195 if (j->seq > ja->seq[bucket_index]) cafe563591446c Kent Overstreet 2013-03-23 196 ja->seq[bucket_index] = j->seq; cafe563591446c Kent Overstreet 2013-03-23 197 next_set: cafe563591446c Kent Overstreet 2013-03-23 198 offset += blocks * ca->sb.block_size; cafe563591446c Kent Overstreet 2013-03-23 199 len -= blocks * ca->sb.block_size; cafe563591446c Kent Overstreet 2013-03-23 200 j = ((void *) j) + blocks * block_bytes(ca); cafe563591446c Kent Overstreet 2013-03-23 201 } cafe563591446c Kent Overstreet 2013-03-23 202 } cafe563591446c Kent Overstreet 2013-03-23 203 cafe563591446c Kent Overstreet 2013-03-23 204 return ret; cafe563591446c Kent Overstreet 2013-03-23 205 } cafe563591446c Kent Overstreet 2013-03-23 206 :::::: The code at line 114 was first introduced by commit :::::: cafe563591446cf80bfbc2fe3bc72a2e36cf1060 bcache: A block layer cache :::::: TO: Kent Overstreet <[email protected]> :::::: CC: Kent Overstreet <[email protected]> --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/[email protected]
.config.gz
Description: application/gzip
_______________________________________________ kbuild mailing list -- [email protected] To unsubscribe send an email to [email protected]
