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libceph: fixup error handling in osdmap_decode()

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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.  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>
This commit is contained in:
Ilya Dryomov 2014-03-13 16:36:14 +02:00 committed by Sage Weil
parent a2505d63ee
commit 597b52f6ca
1 changed files with 27 additions and 26 deletions
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53
net/ceph/osdmap.c
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@ -688,36 +688,37 @@ static int osdmap_decode(void **p, void *end, struct ceph_osdmap *map)
{
u16 version;
u32 len, max, i;
int err = -EINVAL;
u32 epoch = 0;
void *start = *p;
int err;
struct ceph_pg_pool_info *pi;
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 osdmap\n", version);
goto bad;
goto e_inval;
}
if (version < 6) {
pr_warning("got old v %d < 6 of osdmap\n", version);
goto bad;
goto e_inval;
}
ceph_decode_need(p, end, 2*sizeof(u64)+6*sizeof(u32), bad);
ceph_decode_need(p, end, 2*sizeof(u64)+6*sizeof(u32), e_inval);
ceph_decode_copy(p, &map->fsid, sizeof(map->fsid));
epoch = map->epoch = ceph_decode_32(p);
ceph_decode_copy(p, &map->created, sizeof(map->created));
ceph_decode_copy(p, &map->modified, sizeof(map->modified));
ceph_decode_32_safe(p, end, max, bad);
ceph_decode_32_safe(p, end, max, e_inval);
while (max--) {
ceph_decode_need(p, end, 8 + 2, bad);
err = -ENOMEM;
ceph_decode_need(p, end, 8 + 2, e_inval);
pi = kzalloc(sizeof(*pi), GFP_NOFS);
if (!pi)
if (!pi) {
err = -ENOMEM;
goto bad;
}
pi->id = ceph_decode_64(p);
err = __decode_pool(p, end, pi);
if (err < 0) {
@ -728,27 +729,25 @@ static int osdmap_decode(void **p, void *end, struct ceph_osdmap *map)
}
err = __decode_pool_names(p, end, map);
if (err < 0) {
dout("fail to decode pool names");
if (err)
goto bad;
}
ceph_decode_32_safe(p, end, map->pool_max, bad);
ceph_decode_32_safe(p, end, map->pool_max, e_inval);
ceph_decode_32_safe(p, end, map->flags, bad);
ceph_decode_32_safe(p, end, map->flags, e_inval);
max = ceph_decode_32(p);
/* (re)alloc osd arrays */
err = osdmap_set_max_osd(map, max);
if (err < 0)
if (err)
goto bad;
/* osds */
err = -EINVAL;
ceph_decode_need(p, end, 3*sizeof(u32) +
map->max_osd*(1 + sizeof(*map->osd_weight) +
sizeof(*map->osd_addr)), bad);
sizeof(*map->osd_addr)), e_inval);
*p += 4; /* skip length field (should match max) */
ceph_decode_copy(p, map->osd_state, map->max_osd);
@ -762,7 +761,7 @@ static int osdmap_decode(void **p, void *end, struct ceph_osdmap *map)
ceph_decode_addr(&map->osd_addr[i]);
/* pg_temp */
ceph_decode_32_safe(p, end, len, bad);
ceph_decode_32_safe(p, end, len, e_inval);
for (i = 0; i < len; i++) {
int n, j;
struct ceph_pg pgid;
@ -771,16 +770,16 @@ static int osdmap_decode(void **p, void *end, struct ceph_osdmap *map)
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);
n = ceph_decode_32(p);
err = -EINVAL;
if (n > (UINT_MAX - sizeof(*pg)) / sizeof(u32))
goto bad;
ceph_decode_need(p, end, n * sizeof(u32), bad);
err = -ENOMEM;
goto e_inval;
ceph_decode_need(p, end, n * sizeof(u32), e_inval);
pg = kmalloc(sizeof(*pg) + n*sizeof(u32), GFP_NOFS);
if (!pg)
if (!pg) {
err = -ENOMEM;
goto bad;
}
pg->pgid = pgid;
pg->len = n;
for (j = 0; j < n; j++)
@ -794,10 +793,10 @@ static int osdmap_decode(void **p, void *end, struct ceph_osdmap *map)
}
/* crush */
ceph_decode_32_safe(p, end, len, bad);
ceph_decode_32_safe(p, end, len, e_inval);
dout("osdmap_decode crush len %d from off 0x%x\n", len,
(int)(*p - start));
ceph_decode_need(p, end, len, bad);
ceph_decode_need(p, end, len, e_inval);
map->crush = crush_decode(*p, end);
*p += len;
if (IS_ERR(map->crush)) {
@ -812,6 +811,8 @@ static int osdmap_decode(void **p, void *end, struct ceph_osdmap *map)
dout("full osdmap epoch %d max_osd %d\n", map->epoch, map->max_osd);
return 0;
e_inval:
err = -EINVAL;
bad:
pr_err("corrupt full osdmap (%d) epoch %d off %d (%p of %p-%p)\n",
err, epoch, (int)(*p - start), *p, start, end);