ceph: improve error handling in ceph_mdsmap_decode

commit c213b50b7dcbf06abcfbf1e4eee5b76586718bd9 upstream.

This patch makes the following improvements to the error handling
in the ceph_mdsmap_decode function:

- Add a NULL check for return value from kcalloc
- Make use of the variable err

Signed-off-by: Emil Goode <emilgoode@gmail.com>
Signed-off-by: Sage Weil <sage@inktank.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/ceph/mdsmap.c b/fs/ceph/mdsmap.c
index 9278dec9e9400aa222c6e73fcaa144405644c056..d4d38977dcbb0bf8e4cdaf2c0534f8a71c27c2c8 100644 (file)
--- a/fs/ceph/mdsmap.c
+++ b/fs/ceph/mdsmap.c
@@ -138,6 +138,8 @@ struct ceph_mdsmap *ceph_mdsmap_decode(void **p, void *end)
                                m->m_info[mds].export_targets =
                                        kcalloc(num_export_targets, sizeof(u32),
                                                GFP_NOFS);
+                               if (m->m_info[mds].export_targets == NULL)
+                                       goto badmem;
                                for (j = 0; j < num_export_targets; j++)
                                        m->m_info[mds].export_targets[j] =
                                               ceph_decode_32(&pexport_targets);
@@ -170,7 +172,7 @@ bad:
                       DUMP_PREFIX_OFFSET, 16, 1,
                       start, end - start, true);
        ceph_mdsmap_destroy(m);
-       return ERR_PTR(-EINVAL);
+       return ERR_PTR(err);
 }
 
 void ceph_mdsmap_destroy(struct ceph_mdsmap *m)