From 589506f1e7f135943bcd34903bcdcf1fdaf00549 Mon Sep 17 00:00:00 2001 From: Li RongQing Date: Sun, 7 Sep 2014 18:10:51 +0800 Subject: [PATCH] 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 Signed-off-by: Ilya Dryomov --- net/ceph/osdmap.c | 32 ++++++++++++++++---------------- 1 file changed, 16 insertions(+), 16 deletions(-) diff --git a/net/ceph/osdmap.c b/net/ceph/osdmap.c index c547e46084d3..ec4d9e24dcf9 100644 --- a/net/ceph/osdmap.c +++ b/net/ceph/osdmap.c @@ -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); + if (!state) + return -ENOMEM; + map->osd_state = state; + 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 (!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; -- 2.20.1