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udf: check partition reference in udf_read_inode() 

We were checking block number without checking partition.
sbi->s_partmaps[iloc->partitionReferenceNum] could lead to
bad memory access. See udf_nfs_get_inode() path for instance.

Signed-off-by: Fabian Frederick <fabf@skynet.be>
Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Fabian Frederick 2017-01-06 21:54:43 +01:00 committed by Jan Kara
parent 23bcda112f
commit 1d82a56bc5
1 changed files with 6 additions and 0 deletions
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6
fs/udf/inode.c
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@ -1277,6 +1277,12 @@ static int udf_read_inode(struct inode *inode, bool hidden_inode)
int ret = -EIO;
reread:
if (iloc->partitionReferenceNum >= sbi->s_partitions) {
udf_debug("partition reference: %d > logical volume partitions: %d\n",
iloc->partitionReferenceNum, sbi->s_partitions);
return -EIO;
}
if (iloc->logicalBlockNum >=
sbi->s_partmaps[iloc->partitionReferenceNum].s_partition_len) {
udf_debug("block=%d, partition=%d out of range\n",