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Diffstat (limited to 'fs/udf/super.c')
-rw-r--r--fs/udf/super.c24
1 files changed, 17 insertions, 7 deletions
diff --git a/fs/udf/super.c b/fs/udf/super.c
index 81155b9b4..a522c15a0 100644
--- a/fs/udf/super.c
+++ b/fs/udf/super.c
@@ -179,7 +179,8 @@ static int __init init_inodecache(void)
udf_inode_cachep = kmem_cache_create("udf_inode_cache",
sizeof(struct udf_inode_info),
0, (SLAB_RECLAIM_ACCOUNT |
- SLAB_MEM_SPREAD),
+ SLAB_MEM_SPREAD |
+ SLAB_ACCOUNT),
init_once);
if (!udf_inode_cachep)
return -ENOMEM;
@@ -278,17 +279,12 @@ static void udf_sb_free_bitmap(struct udf_bitmap *bitmap)
{
int i;
int nr_groups = bitmap->s_nr_groups;
- int size = sizeof(struct udf_bitmap) + (sizeof(struct buffer_head *) *
- nr_groups);
for (i = 0; i < nr_groups; i++)
if (bitmap->s_block_bitmap[i])
brelse(bitmap->s_block_bitmap[i]);
- if (size <= PAGE_SIZE)
- kfree(bitmap);
- else
- vfree(bitmap);
+ kvfree(bitmap);
}
static void udf_free_partition(struct udf_part_map *map)
@@ -1586,6 +1582,13 @@ static void udf_load_logicalvolint(struct super_block *sb, struct kernel_extent_
}
/*
+ * Maximum number of Terminating Descriptor redirections. The chosen number is
+ * arbitrary - just that we hopefully don't limit any real use of rewritten
+ * inode on write-once media but avoid looping for too long on corrupted media.
+ */
+#define UDF_MAX_TD_NESTING 64
+
+/*
* Process a main/reserve volume descriptor sequence.
* @block First block of first extent of the sequence.
* @lastblock Lastblock of first extent of the sequence.
@@ -1609,6 +1612,7 @@ static noinline int udf_process_sequence(
uint16_t ident;
long next_s = 0, next_e = 0;
int ret;
+ unsigned int indirections = 0;
memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
@@ -1679,6 +1683,12 @@ static noinline int udf_process_sequence(
}
break;
case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
+ if (++indirections > UDF_MAX_TD_NESTING) {
+ udf_err(sb, "too many TDs (max %u supported)\n", UDF_MAX_TD_NESTING);
+ brelse(bh);
+ return -EIO;
+ }
+
vds[VDS_POS_TERMINATING_DESC].block = block;
if (next_e) {
block = next_s;