diff options
Diffstat (limited to 'fs/dlm/dir.c')
| -rw-r--r-- | fs/dlm/dir.c | 28 |
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; |