X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;f=kernel%2Ffs%2Fext4%2Fballoc.c;h=f97110461c196b2b770baa7d2e0b7694cb750fa2;hb=52f993b8e89487ec9ee15a7fb4979e0f09a45b27;hp=fe1f50fe764ff9238354e2e30491c6e1e6d149b9;hpb=c189ccac5702322ed843fe17057035b7222a59b6;p=kvmfornfv.git

diff --git a/kernel/fs/ext4/balloc.c b/kernel/fs/ext4/balloc.c
index fe1f50fe7..f97110461 100644
--- a/kernel/fs/ext4/balloc.c
+++ b/kernel/fs/ext4/balloc.c
@@ -208,6 +208,9 @@ static int ext4_init_block_bitmap(struct super_block *sb,
 	memset(bh->b_data, 0, sb->s_blocksize);
 
 	bit_max = ext4_num_base_meta_clusters(sb, block_group);
+	if ((bit_max >> 3) >= bh->b_size)
+		return -EFSCORRUPTED;
+
 	for (bit = 0; bit < bit_max; bit++)
 		ext4_set_bit(bit, bh->b_data);