From 951744fea0aea9adbd7c8cacb3605f2d69a66f96 Mon Sep 17 00:00:00 2001 From: Dmitriy Monakhov <dmonakhov@openvz.org> Date: Tue, 8 May 2007 00:35:22 -0700 Subject: [PATCH] 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> --- fs/udf/super.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/fs/udf/super.c b/fs/udf/super.c index a92daaba6c4c0..9b8644a06e53b 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)); -- GitLab