From: Darrick J. Wong <darrick.wong@oracle.com>
Date: Tue, 7 Apr 2015 00:04:11 +0000 (+1000)
Subject: libxfs: don't write uninitialized heap contents into new directory blocks
X-Git-Tag: v3.2.3-rc1~11
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=bf43fd2819db4d0863c508335839678b03119962;p=thirdparty%2Fxfsprogs-dev.git

libxfs: don't write uninitialized heap contents into new directory blocks

Clear the contents of the xfs buffer when we're initializing it to avoid
writing random heap contents (and CRC thereof) to disk.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
---

diff --git a/libxfs/rdwr.c b/libxfs/rdwr.c
index 7d7347769..35fb3665a 100644
--- a/libxfs/rdwr.c
+++ b/libxfs/rdwr.c
@@ -411,6 +411,7 @@ __initbuf(xfs_buf_t *bp, struct xfs_buftarg *btp, xfs_daddr_t bno,
 			strerror(errno));
 		exit(1);
 	}
+	memset(bp->b_addr, 0, bytes);
 #ifdef XFS_BUF_TRACING
 	list_head_init(&bp->b_lock_list);
 #endif