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ceph: check buffer size in ceph_vxattrcb_layout()

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If buffer size is zero, return the size of layout vxattr. If buffer
size is not zero, check if it is large enough for layout vxattr.

Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com>
This commit is contained in:
Yan, Zheng 2014-03-24 13:00:54 +08:00 committed by Sage Weil
parent 00bd8edb86
commit 1e5c6649ff
1 changed files with 25 additions and 9 deletions
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34
fs/ceph/xattr.c
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@ -64,32 +64,48 @@ static bool ceph_vxattrcb_layout_exists(struct ceph_inode_info *ci)
}
static size_t ceph_vxattrcb_layout(struct ceph_inode_info *ci, char *val,
size_t size)
size_t size)
{
int ret;
struct ceph_fs_client *fsc = ceph_sb_to_client(ci->vfs_inode.i_sb);
struct ceph_osd_client *osdc = &fsc->client->osdc;
s64 pool = ceph_file_layout_pg_pool(ci->i_layout);
const char *pool_name;
char buf[128];
dout("ceph_vxattrcb_layout %p\n", &ci->vfs_inode);
down_read(&osdc->map_sem);
pool_name = ceph_pg_pool_name_by_id(osdc->osdmap, pool);
if (pool_name)
ret = snprintf(val, size,
"stripe_unit=%lld stripe_count=%lld object_size=%lld pool=%s",
if (pool_name) {
size_t len = strlen(pool_name);
ret = snprintf(buf, sizeof(buf),
"stripe_unit=%lld stripe_count=%lld object_size=%lld pool=",
(unsigned long long)ceph_file_layout_su(ci->i_layout),
(unsigned long long)ceph_file_layout_stripe_count(ci->i_layout),
(unsigned long long)ceph_file_layout_object_size(ci->i_layout),
pool_name);
else
ret = snprintf(val, size,
(unsigned long long)ceph_file_layout_object_size(ci->i_layout));
if (!size) {
ret += len;
} else if (ret + len > size) {
ret = -ERANGE;
} else {
memcpy(val, buf, ret);
memcpy(val + ret, pool_name, len);
ret += len;
}
} else {
ret = snprintf(buf, sizeof(buf),
"stripe_unit=%lld stripe_count=%lld object_size=%lld pool=%lld",
(unsigned long long)ceph_file_layout_su(ci->i_layout),
(unsigned long long)ceph_file_layout_stripe_count(ci->i_layout),
(unsigned long long)ceph_file_layout_object_size(ci->i_layout),
(unsigned long long)pool);
if (size) {
if (ret <= size)
memcpy(val, buf, ret);
else
ret = -ERANGE;
}
}
up_read(&osdc->map_sem);
return ret;
}