From: Dmitriy Monakhov Date: Tue, 8 May 2007 07:35:22 +0000 (-0700) Subject: udf: possible null pointer dereference while load_partition X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=951744fea0aea9adbd7c8cacb3605f2d69a66f96;p=openwrt%2Fstaging%2Fblogic.git udf: possible null pointer dereference while load_partition sb_read may return NULL, let's explicitly check it. Signed-off-by: Dmitriy Monakhov Cc: Jan Kara Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/fs/udf/super.c b/fs/udf/super.c index a92daaba6c4c..9b8644a06e53 100644 --- 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));