udf: possible null pointer dereference while load_partition

sb_read may return NULL, let's explicitly check it.

Signed-off-by: Dmitriy Monakhov <dmonakhov@openvz.org>
Cc: Jan Kara <jack@ucw.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/udf/super.c b/fs/udf/super.c
index a92daab..9b8644a 100644 (file)
--- a/fs/udf/super.c
+++ b/fs/udf/super.c
@@ -1403,6 +1403,8 @@ udf_load_partition(struct super_block *sb, kernel_lb_addr *fileset)
 
                                        pos = udf_block_map(UDF_SB_VAT(sb), 0);
                                        bh = sb_bread(sb, pos);
+                                       if (!bh)
+                                               return 1;
                                        UDF_SB_TYPEVIRT(sb,i).s_start_offset =
                                                le16_to_cpu(((struct virtualAllocationTable20 *)bh->b_data + udf_ext0_offset(UDF_SB_VAT(sb)))->lengthHeader) +
                                                        udf_ext0_offset(UDF_SB_VAT(sb));