This is a note to let you know that I've just added the patch titled
udf: Avoid run away loop when partition table length is corrupted
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
udf-avoid-run-away-loop-when-partition-table-length-is-corrupted.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From adee11b2085bee90bd8f4f52123ffb07882d6256 Mon Sep 17 00:00:00 2001
From: Jan Kara <[email protected]>
Date: Wed, 27 Jun 2012 20:20:22 +0200
Subject: udf: Avoid run away loop when partition table length is corrupted
From: Jan Kara <[email protected]>
commit adee11b2085bee90bd8f4f52123ffb07882d6256 upstream.
Check provided length of partition table so that (possibly maliciously)
corrupted partition table cannot cause accessing data beyond current buffer.
Signed-off-by: Jan Kara <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
fs/udf/super.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
--- a/fs/udf/super.c
+++ b/fs/udf/super.c
@@ -1225,6 +1225,7 @@ static int udf_load_logicalvol(struct su
struct genericPartitionMap *gpm;
uint16_t ident;
struct buffer_head *bh;
+ unsigned int table_len;
int ret = 0;
bh = udf_read_tagged(sb, block, block, &ident);
@@ -1232,13 +1233,20 @@ static int udf_load_logicalvol(struct su
return 1;
BUG_ON(ident != TAG_IDENT_LVD);
lvd = (struct logicalVolDesc *)bh->b_data;
+ table_len = le32_to_cpu(lvd->mapTableLength);
+ if (sizeof(*lvd) + table_len > sb->s_blocksize) {
+ udf_err(sb, "error loading logical volume descriptor: "
+ "Partition table too long (%u > %lu)\n", table_len,
+ sb->s_blocksize - sizeof(*lvd));
+ goto out_bh;
+ }
ret = udf_sb_alloc_partition_maps(sb,
le32_to_cpu(lvd->numPartitionMaps));
if (ret)
goto out_bh;
for (i = 0, offset = 0;
- i < sbi->s_partitions && offset < le32_to_cpu(lvd->mapTableLength);
+ i < sbi->s_partitions && offset < table_len;
i++, offset += gpm->partitionMapLength) {
struct udf_part_map *map = &sbi->s_partmaps[i];
gpm = (struct genericPartitionMap *)
Patches currently in stable-queue which might be from [email protected] are
queue-3.4/udf-fortify-loading-of-sparing-table.patch
queue-3.4/udf-avoid-run-away-loop-when-partition-table-length-is-corrupted.patch
queue-3.4/udf-use-ret-instead-of-abusing-i-in-udf_load_logicalvol.patch
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