When we create 100 partitions (major is 259 not 254) in a raid device, mdadm may coredump:

Core was generated by `/usr/sbin/mdadm --detail --export /dev/md1p3'. Program terminated with signal SIGSEGV, Segmentation fault. #0 __strlen_sse2 () at ../sysdeps/x86_64/multiarch/strlen-vec.S:126 126 movdqu (%rax), %xmm4 (gdb) bt #0 __strlen_sse2 () at ../sysdeps/x86_64/multiarch/strlen-vec.S:126 #1 0x00007f1944659139 in __strcpy_chk ( dest=dest@entry=0x55ea8d7c23ac "", src=0x0, destlen=destlen@entry=32) at strcpy_chk.c:28 #2 0x000055ea8d10b66d in strcpy (__src=<optimized out>, __dest=0x55ea8d7c23ac "") at /usr/include/bits/string_fortified.h:79 #3 super_by_fd (fd=fd@entry=3, subarrayp=subarrayp@entry=0x7ffe6a1dff08) at util.c:1289 #4 0x000055ea8d11b3a6 in Detail ( dev=0x7ffe6a1e2f22 "/dev/md1p3", c=0x7ffe6a1e1700) at Detail.c:101 #5 0x000055ea8d101e61 in misc_list (c=<optimized out>, ss=<optimized out>, dump_directory=<optimized out>, ident=<optimized out>, devlist=<optimized out>) at mdadm.c:1959 #6 main (argc=<optimized out>, argv=<optimized out>) at mdadm.c:1629

The direct cause is fd2devnm returning NULL, so add a check. Similarly, add a check in map_by_devnm to avoid coredump.

Fix issue:https://gitee.com/src-openeuler/mdadm/issues/I68G5I?from=project-issue

Signed-off-by: Lixiaokeng lixiaokeng@huawei.com Signed-off-by: Wuguanghao wuguanghao3@huawei.com --- mapfile.c | 4 ++++ util.c | 7 ++++++- 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/mapfile.c b/mapfile.c index 8d7acb3..f72fe0d 100644 --- a/mapfile.c +++ b/mapfile.c @@ -292,6 +292,10 @@ struct map_ent *map_by_uuid(struct map_ent **map, int uuid[4]) struct map_ent *map_by_devnm(struct map_ent **map, char *devnm) { struct map_ent *mp; + + if (!devnm) + return NULL; + if (!*map) map_read(map);

diff --git a/util.c b/util.c index 64dd409..3a84ee3 100644 --- a/util.c +++ b/util.c @@ -1241,6 +1241,11 @@ struct supertype *super_by_fd(int fd, char **subarrayp) int i; char *subarray = NULL; char container[32] = ""; + char *devnm = NULL; + + devnm = fd2devnm(fd); + if (!devnm) + return NULL;

sra = sysfs_read(fd, NULL, GET_VERSION);

@@ -1286,7 +1291,7 @@ struct supertype *super_by_fd(int fd, char **subarrayp) if (subarrayp) *subarrayp = subarray; strcpy(st->container_devnm, container); - strcpy(st->devnm, fd2devnm(fd)); + strcpy(st->devnm, devnm); } else free(subarray);