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udf: Verify partition map count 

Verify that number of partition maps isn't insanely high which can lead
to large allocation in udf_sb_alloc_partition_maps(). All partition maps
have to fit in the LVD which is in a single block.

Reported-by: syzbot+478f2c1a6f0f447a46bb@syzkaller.appspotmail.com
Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Jan Kara 2025-07-11 19:01:20 +02:00
parent 185d3490fe
commit 1a11201668
1 changed files with 11 additions and 2 deletions
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13
fs/udf/super.c
View File

@ -1440,7 +1440,7 @@ static int udf_load_logicalvol(struct super_block *sb, sector_t block,
struct genericPartitionMap *gpm;
uint16_t ident;
struct buffer_head *bh;
unsigned int table_len;
unsigned int table_len, part_map_count;
int ret;
bh = udf_read_tagged(sb, block, block, &ident);
@ -1461,7 +1461,16 @@ static int udf_load_logicalvol(struct super_block *sb, sector_t block,
"logical volume");
if (ret)
goto out_bh;
ret = udf_sb_alloc_partition_maps(sb, le32_to_cpu(lvd->numPartitionMaps));
part_map_count = le32_to_cpu(lvd->numPartitionMaps);
if (part_map_count > table_len / sizeof(struct genericPartitionMap1)) {
udf_err(sb, "error loading logical volume descriptor: "
"Too many partition maps (%u > %u)\n", part_map_count,
table_len / (unsigned)sizeof(struct genericPartitionMap1));
ret = -EIO;
goto out_bh;
}
ret = udf_sb_alloc_partition_maps(sb, part_map_count);
if (ret)
goto out_bh;