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authorYingtai Xie <xieyingtai@huawei.com>2014-08-06 16:03:54 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2014-08-06 18:01:13 -0700
commit981035b47d7da8ba7c153ed431bf515f593853d8 (patch)
tree675aab83a7118389728f0dbcc733a3d3cf18ae8d /fs/ocfs2/alloc.c
parentc811f5f41e37d16b2839988426ffde78d2273d48 (diff)
ocfs2: correctly check the return value of ocfs2_search_extent_list
ocfs2_search_extent_list may return -1, so we should check the return value in ocfs2_split_and_insert, otherwise it may cause array index out of bound. And ocfs2_search_extent_list can only return value less than el->l_next_free_rec, so check if it is equal or larger than le16_to_cpu(el->l_next_free_rec) is meaningless. Signed-off-by: Yingtai Xie <xieyingtai@huawei.com> Signed-off-by: Joseph Qi <joseph.qi@huawei.com> Cc: Joel Becker <jlbec@evilplan.org> Cc: Mark Fasheh <mfasheh@suse.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/ocfs2/alloc.c')
-rw-r--r--fs/ocfs2/alloc.c15
1 files changed, 12 insertions, 3 deletions
diff --git a/fs/ocfs2/alloc.c b/fs/ocfs2/alloc.c
index 9d8fcf2f3b94..a93bf9892256 100644
--- a/fs/ocfs2/alloc.c
+++ b/fs/ocfs2/alloc.c
@@ -4961,6 +4961,15 @@ leftright:
el = path_leaf_el(path);
split_index = ocfs2_search_extent_list(el, cpos);
+ if (split_index == -1) {
+ ocfs2_error(ocfs2_metadata_cache_get_super(et->et_ci),
+ "Owner %llu has an extent at cpos %u "
+ "which can no longer be found.\n",
+ (unsigned long long)ocfs2_metadata_cache_owner(et->et_ci),
+ cpos);
+ ret = -EROFS;
+ goto out;
+ }
goto leftright;
}
out:
@@ -5135,7 +5144,7 @@ int ocfs2_change_extent_flag(handle_t *handle,
el = path_leaf_el(left_path);
index = ocfs2_search_extent_list(el, cpos);
- if (index == -1 || index >= le16_to_cpu(el->l_next_free_rec)) {
+ if (index == -1) {
ocfs2_error(sb,
"Owner %llu has an extent at cpos %u which can no "
"longer be found.\n",
@@ -5491,7 +5500,7 @@ int ocfs2_remove_extent(handle_t *handle,
el = path_leaf_el(path);
index = ocfs2_search_extent_list(el, cpos);
- if (index == -1 || index >= le16_to_cpu(el->l_next_free_rec)) {
+ if (index == -1) {
ocfs2_error(ocfs2_metadata_cache_get_super(et->et_ci),
"Owner %llu has an extent at cpos %u which can no "
"longer be found.\n",
@@ -5557,7 +5566,7 @@ int ocfs2_remove_extent(handle_t *handle,
el = path_leaf_el(path);
index = ocfs2_search_extent_list(el, cpos);
- if (index == -1 || index >= le16_to_cpu(el->l_next_free_rec)) {
+ if (index == -1) {
ocfs2_error(ocfs2_metadata_cache_get_super(et->et_ci),
"Owner %llu: split at cpos %u lost record.",
(unsigned long long)ocfs2_metadata_cache_owner(et->et_ci),