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libceph: fix a use after free issue in osdmap_set_max_osd 

If the state variable is krealloced successfully, map->osd_state will be
freed, once following two reallocation failed, and exit the function
without resetting map->osd_state, map->osd_state become a wild pointer.

fix it by resetting them after krealloc successfully.

Signed-off-by: Li RongQing <roy.qing.li@gmail.com>
Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com>
This commit is contained in:
Li RongQing 2014-09-07 18:10:51 +08:00 committed by Ilya Dryomov
parent dc220db03f
commit 589506f1e7
1 changed files with 18 additions and 18 deletions
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36
net/ceph/osdmap.c
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@ -671,26 +671,26 @@ static int osdmap_set_max_osd(struct ceph_osdmap *map, int max)
int i;
state = krealloc(map->osd_state, max*sizeof(*state), GFP_NOFS);
weight = krealloc(map->osd_weight, max*sizeof(*weight), GFP_NOFS);
addr = krealloc(map->osd_addr, max*sizeof(*addr), GFP_NOFS);
if (!state || !weight || !addr) {
kfree(state);
kfree(weight);
kfree(addr);
if (!state)
return -ENOMEM;
}
map->osd_state = state;
weight = krealloc(map->osd_weight, max*sizeof(*weight), GFP_NOFS);
if (!weight)
return -ENOMEM;
map->osd_weight = weight;
addr = krealloc(map->osd_addr, max*sizeof(*addr), GFP_NOFS);
if (!addr)
return -ENOMEM;
map->osd_addr = addr;
for (i = map->max_osd; i < max; i++) {
state[i] = 0;
weight[i] = CEPH_OSD_OUT;
memset(addr + i, 0, sizeof(*addr));
map->osd_state[i] = 0;
map->osd_weight[i] = CEPH_OSD_OUT;
memset(map->osd_addr + i, 0, sizeof(*map->osd_addr));
}
map->osd_state = state;
map->osd_weight = weight;
map->osd_addr = addr;
if (map->osd_primary_affinity) {
u32 *affinity;
@ -698,11 +698,11 @@ static int osdmap_set_max_osd(struct ceph_osdmap *map, int max)
max*sizeof(*affinity), GFP_NOFS);
if (!affinity)
return -ENOMEM;
map->osd_primary_affinity = affinity;
for (i = map->max_osd; i < max; i++)
affinity[i] = CEPH_OSD_DEFAULT_PRIMARY_AFFINITY;
map->osd_primary_affinity = affinity;
map->osd_primary_affinity[i] =
CEPH_OSD_DEFAULT_PRIMARY_AFFINITY;
}
map->max_osd = max;