From: Jan Kara <[email protected]> 3.12-stable review patch. If anyone has any objections, please let me know.
=============== commit 23b133bdc452aa441fcb9b82cbf6dd05cfd342d0 upstream. Check length of extended attributes and allocation descriptors when loading inodes from disk. Otherwise corrupted filesystems could confuse the code and make the kernel oops. Reported-by: Carl Henrik Lunde <[email protected]> Cc: [email protected] Signed-off-by: Jan Kara <[email protected]> Signed-off-by: Jiri Slaby <[email protected]> --- fs/udf/inode.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/fs/udf/inode.c b/fs/udf/inode.c index cbc438e8f406..b0774f245199 100644 --- a/fs/udf/inode.c +++ b/fs/udf/inode.c @@ -1493,6 +1493,15 @@ static void udf_fill_inode(struct inode *inode, struct buffer_head *bh) iinfo->i_checkpoint = le32_to_cpu(efe->checkpoint); } + /* + * Sanity check length of allocation descriptors and extended attrs to + * avoid integer overflows + */ + if (iinfo->i_lenEAttr > bs || iinfo->i_lenAlloc > bs) + return; + /* Now do exact checks */ + if (udf_file_entry_alloc_offset(inode) + iinfo->i_lenAlloc > bs) + return; /* Sanity checks for files in ICB so that we don't get confused later */ if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) { /* -- 2.4.6 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
