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Message-Id: <1378439682-12830-4-git-send-email-phillip@squashfs.org.uk> Date: Fri, 6 Sep 2013 04:54:39 +0100 From: Phillip Lougher <phillip@...ashfs.org.uk> To: linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org Cc: Phillip Lougher <phillip@...ashfs.org.uk> Subject: [PATCH 3/5] Squashfs: fix corruption checks in squashfs_readdir() The dir_count and size fields when read from disk are sanity checked for correctness. However, the sanity checks only check the values are not greater than expected. As dir_count and size were incorrectly defined as signed ints, this can lead to corrupted values appearing as negative which are not trapped. Signed-off-by: Phillip Lougher <phillip@...ashfs.org.uk> --- fs/squashfs/dir.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/fs/squashfs/dir.c b/fs/squashfs/dir.c index f7f527b..1192084 100644 --- a/fs/squashfs/dir.c +++ b/fs/squashfs/dir.c @@ -105,9 +105,8 @@ static int squashfs_readdir(struct file *file, struct dir_context *ctx) struct inode *inode = file_inode(file); struct squashfs_sb_info *msblk = inode->i_sb->s_fs_info; u64 block = squashfs_i(inode)->start + msblk->directory_table; - int offset = squashfs_i(inode)->offset, length, dir_count, size, - type, err; - unsigned int inode_number; + int offset = squashfs_i(inode)->offset, length, type, err; + unsigned int inode_number, dir_count, size; struct squashfs_dir_header dirh; struct squashfs_dir_entry *dire; -- 1.8.3.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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