From f5cc15dac55d4943176f84681f37aa48094ffa8b Mon Sep 17 00:00:00 2001 From: Jan Kara Date: Thu, 30 Aug 2007 23:56:22 -0700 Subject: [PATCH] Fix possible NULL pointer dereference in udf_table_free_blocks() Fix possible NULL pointer dereference when freeing blocks in case table of free space is used. Also fix handling of the case when we need to move extent from one block to another one to make space for indirect extent. BTW: Nobody seem to have ever used this code. Signed-off-by: Jan Kara Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/udf/balloc.c | 10 ++++------ 1 file changed, 4 insertions(+), 6 deletions(-) diff --git a/fs/udf/balloc.c b/fs/udf/balloc.c index 276f7207a56..87e87dcd3f9 100644 --- a/fs/udf/balloc.c +++ b/fs/udf/balloc.c @@ -540,26 +540,24 @@ static void udf_table_free_blocks(struct super_block *sb, if (epos.offset + adsize > sb->s_blocksize) { loffset = epos.offset; aed->lengthAllocDescs = cpu_to_le32(adsize); - sptr = UDF_I_DATA(inode) + epos.offset - - udf_file_entry_alloc_offset(inode) + - UDF_I_LENEATTR(inode) - adsize; + sptr = UDF_I_DATA(table) + epos.offset - adsize; dptr = epos.bh->b_data + sizeof(struct allocExtDesc); memcpy(dptr, sptr, adsize); epos.offset = sizeof(struct allocExtDesc) + adsize; } else { loffset = epos.offset + adsize; aed->lengthAllocDescs = cpu_to_le32(0); - sptr = oepos.bh->b_data + epos.offset; - epos.offset = sizeof(struct allocExtDesc); - if (oepos.bh) { + sptr = oepos.bh->b_data + epos.offset; aed = (struct allocExtDesc *)oepos.bh->b_data; aed->lengthAllocDescs = cpu_to_le32(le32_to_cpu(aed->lengthAllocDescs) + adsize); } else { + sptr = UDF_I_DATA(table) + epos.offset; UDF_I_LENALLOC(table) += adsize; mark_inode_dirty(table); } + epos.offset = sizeof(struct allocExtDesc); } if (UDF_SB_UDFREV(sb) >= 0x0200) udf_new_tag(epos.bh->b_data, TAG_IDENT_AED, 3, 1, -- 2.20.1