Don't crash when utilities are dumb and try to read less than the disk block

size (dumpfs may try to read the cylinder size (or is is sector size?) by way
of bread).  Prevents a bounds error.

1 files changed, 1 insertions, 1 deletions

diff --git a/lib/libufs/block.c b/lib/libufs/block.c
index 7586c43..234991a 100644
--- a/lib/libufs/block.c
+++ b/lib/libufs/block.c
@@ -63,7 +63,7 @@ bread(struct uufsd *disk, ufs2_daddr_t blockno, void *data, size_t size)
 	 */
 	if (cnt != size) {
 		ERROR(disk, "short read from block device");
-		for (cnt = 0; cnt < disk->d_fs.fs_bsize; cnt++)
+		for (cnt = 0; cnt < MIN(size, disk->d_fs.fs_bsize); cnt++)
 			buf[cnt] = 0;
 		return -1;
 	}