On 03/27/2014 01:17 PM, Ilya Dryomov wrote: > 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.
Same comments as last time. Otherwise, looks good. Reviewed-by: Alex Elder <[email protected]> > Signed-off-by: Ilya Dryomov <[email protected]> > --- > net/ceph/osdmap.c | 66 > +++++++++++++++++++++++++++-------------------------- > 1 file changed, 34 insertions(+), 32 deletions(-) > > diff --git a/net/ceph/osdmap.c b/net/ceph/osdmap.c > index b70357adbdc0..0fc29a930c06 100644 > --- a/net/ceph/osdmap.c > +++ b/net/ceph/osdmap.c > @@ -861,19 +861,19 @@ 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); > @@ -882,7 +882,7 @@ 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); > @@ -890,13 +890,14 @@ 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; > } > > @@ -906,13 +907,13 @@ 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; > } > > @@ -926,11 +927,11 @@ 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); > @@ -947,29 +948,28 @@ 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); > @@ -978,11 +978,11 @@ 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) > @@ -994,10 +994,10 @@ 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, > @@ -1008,7 +1008,7 @@ 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; > @@ -1018,22 +1018,22 @@ 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++) > @@ -1057,6 +1057,8 @@ 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); > -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
