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| author | Seth Jennings <sjenning@linux.vnet.ibm.com> | 2012-02-28 16:02:23 -0600 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-02-29 15:23:38 -0800 |
| commit | 041aba19b916ddfd5254c80ef413ef8a7e76c8ad (patch) | |
| tree | d85fb7795954cb4e59b361d98435983bb265a77a /drivers/staging/zcache | |
| parent | 843c666d16e62e4b3889f1491a1d91b87ddc7bd3 (diff) | |
| download | linux-041aba19b916ddfd5254c80ef413ef8a7e76c8ad.tar.bz2 | |
staging: zcache: fix memory corruption bug
This patch fixes a bug where the zv code writes before the allocated
buffer, resulting in system memory corruption. This was introduced
during the switch from xvmalloc to zsmalloc.
Signed-off-by: Seth Jennings <sjenning@linux.vnet.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/staging/zcache')
| -rw-r--r-- | drivers/staging/zcache/zcache-main.c | 6 |
1 files changed, 2 insertions, 4 deletions
diff --git a/drivers/staging/zcache/zcache-main.c b/drivers/staging/zcache/zcache-main.c index 46c7c04c2451..70734652f724 100644 --- a/drivers/staging/zcache/zcache-main.c +++ b/drivers/staging/zcache/zcache-main.c @@ -701,7 +701,6 @@ static struct zv_hdr *zv_create(struct zs_pool *pool, uint32_t pool_id, u32 size = clen + sizeof(struct zv_hdr); int chunks = (size + (CHUNK_SIZE - 1)) >> CHUNK_SHIFT; void *handle = NULL; - char *buf; BUG_ON(!irqs_disabled()); BUG_ON(chunks >= NCHUNKS); @@ -710,14 +709,13 @@ static struct zv_hdr *zv_create(struct zs_pool *pool, uint32_t pool_id, goto out; atomic_inc(&zv_curr_dist_counts[chunks]); atomic_inc(&zv_cumul_dist_counts[chunks]); - zv = (struct zv_hdr *)((char *)cdata - sizeof(*zv)); + zv = zs_map_object(pool, handle); zv->index = index; zv->oid = *oid; zv->pool_id = pool_id; zv->size = clen; SET_SENTINEL(zv, ZVH); - buf = zs_map_object(pool, handle); - memcpy(buf, zv, clen + sizeof(*zv)); + memcpy((char *)zv + sizeof(struct zv_hdr), cdata, clen); zs_unmap_object(pool, handle); out: return handle; |