aboutsummaryrefslogtreecommitdiff
path: root/fs/dlm/dir.c
diff options
context:
space:
mode:
Diffstat (limited to 'fs/dlm/dir.c')
-rw-r--r--fs/dlm/dir.c28
1 files changed, 24 insertions, 4 deletions
diff --git a/fs/dlm/dir.c b/fs/dlm/dir.c
index ff97ba92433..85defeb64df 100644
--- a/fs/dlm/dir.c
+++ b/fs/dlm/dir.c
@@ -220,6 +220,7 @@ int dlm_recover_directory(struct dlm_ls *ls)
last_len = 0;
for (;;) {
+ int left;
error = dlm_recovery_stopped(ls);
if (error)
goto out_free;
@@ -235,12 +236,21 @@ int dlm_recover_directory(struct dlm_ls *ls)
* pick namelen/name pairs out of received buffer
*/
- b = ls->ls_recover_buf + sizeof(struct dlm_rcom);
+ b = ls->ls_recover_buf->rc_buf;
+ left = ls->ls_recover_buf->rc_header.h_length;
+ left -= sizeof(struct dlm_rcom);
for (;;) {
- memcpy(&namelen, b, sizeof(uint16_t));
- namelen = be16_to_cpu(namelen);
- b += sizeof(uint16_t);
+ __be16 v;
+
+ error = -EINVAL;
+ if (left < sizeof(__be16))
+ goto out_free;
+
+ memcpy(&v, b, sizeof(__be16));
+ namelen = be16_to_cpu(v);
+ b += sizeof(__be16);
+ left -= sizeof(__be16);
/* namelen of 0xFFFFF marks end of names for
this node; namelen of 0 marks end of the
@@ -251,6 +261,12 @@ int dlm_recover_directory(struct dlm_ls *ls)
if (!namelen)
break;
+ if (namelen > left)
+ goto out_free;
+
+ if (namelen > DLM_RESNAME_MAXLEN)
+ goto out_free;
+
error = -ENOMEM;
de = get_free_de(ls, namelen);
if (!de)
@@ -262,6 +278,7 @@ int dlm_recover_directory(struct dlm_ls *ls)
memcpy(de->name, b, namelen);
memcpy(last_name, b, namelen);
b += namelen;
+ left -= namelen;
add_entry_to_hash(ls, de);
count++;
@@ -302,6 +319,9 @@ static int get_entry(struct dlm_ls *ls, int nodeid, char *name,
write_unlock(&ls->ls_dirtbl[bucket].lock);
+ if (namelen > DLM_RESNAME_MAXLEN)
+ return -EINVAL;
+
de = kzalloc(sizeof(struct dlm_direntry) + namelen, GFP_KERNEL);
if (!de)
return -ENOMEM;