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author | Ilya Dryomov <ilya.dryomov@inktank.com> | 2014-03-13 16:36:15 +0200 |
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committer | Sage Weil <sage@inktank.com> | 2014-04-04 21:07:44 -0700 |
commit | 86f1742b94dd0b4a2eb9255205d1756ddea182f8 (patch) | |
tree | 3ac1c58709b0aba00d2acb15ef17bc49ff630cf8 /net/ceph/osdmap.c | |
parent | 9902e682c7f3df9ed5f60bc6f9c7efa6fd6b2d1d (diff) | |
download | linux-next-86f1742b94dd0b4a2eb9255205d1756ddea182f8.tar.gz |
libceph: fixup error handling in osdmap_apply_incremental()
The existing error handling scheme requires resetting err to -EINVAL
prior to calling any ceph_decode_* macro. This is ugly and fragile,
and there already are a few places where we would return 0 on error,
due to a missing reset. Follow osdmap_decode() and fix this by adding
a special e_inval label to be used by all ceph_decode_* macros.
Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com>
Reviewed-by: Alex Elder <elder@linaro.org>
Diffstat (limited to 'net/ceph/osdmap.c')
-rw-r--r-- | net/ceph/osdmap.c | 66 |
1 files changed, 34 insertions, 32 deletions
diff --git a/net/ceph/osdmap.c b/net/ceph/osdmap.c index d4a6b0df3627..b844a9273666 100644 --- a/net/ceph/osdmap.c +++ b/net/ceph/osdmap.c @@ -867,19 +867,19 @@ struct ceph_osdmap *osdmap_apply_incremental(void **p, void *end, __s64 new_pool_max; __s32 new_flags, max; void *start = *p; - int err = -EINVAL; + int err; u16 version; dout("%s %p to %p len %d\n", __func__, *p, end, (int)(end - *p)); - ceph_decode_16_safe(p, end, version, bad); + ceph_decode_16_safe(p, end, version, e_inval); if (version != 6) { pr_warning("got unknown v %d != 6 of inc osdmap\n", version); - goto bad; + goto e_inval; } ceph_decode_need(p, end, sizeof(fsid)+sizeof(modified)+2*sizeof(u32), - bad); + e_inval); ceph_decode_copy(p, &fsid, sizeof(fsid)); epoch = ceph_decode_32(p); BUG_ON(epoch != map->epoch+1); @@ -888,7 +888,7 @@ struct ceph_osdmap *osdmap_apply_incremental(void **p, void *end, new_flags = ceph_decode_32(p); /* full map? */ - ceph_decode_32_safe(p, end, len, bad); + ceph_decode_32_safe(p, end, len, e_inval); if (len > 0) { dout("apply_incremental full map len %d, %p to %p\n", len, *p, end); @@ -896,13 +896,14 @@ struct ceph_osdmap *osdmap_apply_incremental(void **p, void *end, } /* new crush? */ - ceph_decode_32_safe(p, end, len, bad); + ceph_decode_32_safe(p, end, len, e_inval); if (len > 0) { - dout("apply_incremental new crush map len %d, %p to %p\n", - len, *p, end); newcrush = crush_decode(*p, min(*p+len, end)); - if (IS_ERR(newcrush)) - return ERR_CAST(newcrush); + if (IS_ERR(newcrush)) { + err = PTR_ERR(newcrush); + newcrush = NULL; + goto bad; + } *p += len; } @@ -912,13 +913,13 @@ struct ceph_osdmap *osdmap_apply_incremental(void **p, void *end, if (new_pool_max >= 0) map->pool_max = new_pool_max; - ceph_decode_need(p, end, 5*sizeof(u32), bad); + ceph_decode_need(p, end, 5*sizeof(u32), e_inval); /* new max? */ max = ceph_decode_32(p); if (max >= 0) { err = osdmap_set_max_osd(map, max); - if (err < 0) + if (err) goto bad; } @@ -932,11 +933,11 @@ struct ceph_osdmap *osdmap_apply_incremental(void **p, void *end, } /* new_pool */ - ceph_decode_32_safe(p, end, len, bad); + ceph_decode_32_safe(p, end, len, e_inval); while (len--) { struct ceph_pg_pool_info *pi; - ceph_decode_64_safe(p, end, pool, bad); + ceph_decode_64_safe(p, end, pool, e_inval); pi = __lookup_pg_pool(&map->pg_pools, pool); if (!pi) { pi = kzalloc(sizeof(*pi), GFP_NOFS); @@ -953,29 +954,28 @@ struct ceph_osdmap *osdmap_apply_incremental(void **p, void *end, } if (version >= 5) { err = __decode_pool_names(p, end, map); - if (err < 0) + if (err) goto bad; } /* old_pool */ - ceph_decode_32_safe(p, end, len, bad); + ceph_decode_32_safe(p, end, len, e_inval); while (len--) { struct ceph_pg_pool_info *pi; - ceph_decode_64_safe(p, end, pool, bad); + ceph_decode_64_safe(p, end, pool, e_inval); pi = __lookup_pg_pool(&map->pg_pools, pool); if (pi) __remove_pg_pool(&map->pg_pools, pi); } /* new_up */ - err = -EINVAL; - ceph_decode_32_safe(p, end, len, bad); + ceph_decode_32_safe(p, end, len, e_inval); while (len--) { u32 osd; struct ceph_entity_addr addr; - ceph_decode_32_safe(p, end, osd, bad); - ceph_decode_copy_safe(p, end, &addr, sizeof(addr), bad); + ceph_decode_32_safe(p, end, osd, e_inval); + ceph_decode_copy_safe(p, end, &addr, sizeof(addr), e_inval); ceph_decode_addr(&addr); pr_info("osd%d up\n", osd); BUG_ON(osd >= map->max_osd); @@ -984,11 +984,11 @@ struct ceph_osdmap *osdmap_apply_incremental(void **p, void *end, } /* new_state */ - ceph_decode_32_safe(p, end, len, bad); + ceph_decode_32_safe(p, end, len, e_inval); while (len--) { u32 osd; u8 xorstate; - ceph_decode_32_safe(p, end, osd, bad); + ceph_decode_32_safe(p, end, osd, e_inval); xorstate = **(u8 **)p; (*p)++; /* clean flag */ if (xorstate == 0) @@ -1000,10 +1000,10 @@ struct ceph_osdmap *osdmap_apply_incremental(void **p, void *end, } /* new_weight */ - ceph_decode_32_safe(p, end, len, bad); + ceph_decode_32_safe(p, end, len, e_inval); while (len--) { u32 osd, off; - ceph_decode_need(p, end, sizeof(u32)*2, bad); + ceph_decode_need(p, end, sizeof(u32)*2, e_inval); osd = ceph_decode_32(p); off = ceph_decode_32(p); pr_info("osd%d weight 0x%x %s\n", osd, off, @@ -1014,7 +1014,7 @@ struct ceph_osdmap *osdmap_apply_incremental(void **p, void *end, } /* new_pg_temp */ - ceph_decode_32_safe(p, end, len, bad); + ceph_decode_32_safe(p, end, len, e_inval); while (len--) { struct ceph_pg_mapping *pg; int j; @@ -1024,22 +1024,22 @@ struct ceph_osdmap *osdmap_apply_incremental(void **p, void *end, err = ceph_decode_pgid(p, end, &pgid); if (err) goto bad; - ceph_decode_need(p, end, sizeof(u32), bad); + ceph_decode_need(p, end, sizeof(u32), e_inval); pglen = ceph_decode_32(p); if (pglen) { - ceph_decode_need(p, end, pglen*sizeof(u32), bad); + ceph_decode_need(p, end, pglen*sizeof(u32), e_inval); /* removing existing (if any) */ (void) __remove_pg_mapping(&map->pg_temp, pgid); /* insert */ - err = -EINVAL; if (pglen > (UINT_MAX - sizeof(*pg)) / sizeof(u32)) - goto bad; - err = -ENOMEM; + goto e_inval; pg = kmalloc(sizeof(*pg) + sizeof(u32)*pglen, GFP_NOFS); - if (!pg) + if (!pg) { + err = -ENOMEM; goto bad; + } pg->pgid = pgid; pg->len = pglen; for (j = 0; j < pglen; j++) @@ -1063,6 +1063,8 @@ struct ceph_osdmap *osdmap_apply_incremental(void **p, void *end, dout("inc osdmap epoch %d max_osd %d\n", map->epoch, map->max_osd); return map; +e_inval: + err = -EINVAL; bad: pr_err("corrupt inc osdmap (%d) epoch %d off %d (%p of %p-%p)\n", err, epoch, (int)(*p - start), *p, start, end); |