xv6

Unnamed repository; edit this file 'description' to name the repository.
Log | Files | Refs | README | LICENSE

commit 96b7da5f03e8fd1722cb66ef3cb7fcc02d703860
parent f70ef994dce8f6948edec8c534ae21742141dd50
Author: Nickolai Zeldovich <nickolai@csail.mit.edu>
Date:   Fri, 24 Jun 2011 05:26:57 -0400

do not run past the end of the disk!
[ cherry-picked de6075ff0978108daea1d658425bcb37663a98a0 ]

Conflicts:

	fs.c

Diffstat:
Mfs.c | 2+-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs.c b/fs.c @@ -61,7 +61,7 @@ balloc(uint dev) readsb(dev, &sb); for(b = 0; b < sb.size; b += BPB){ bp = bread(dev, BBLOCK(b, sb.ninodes)); - for(bi = 0; bi < BPB; bi++){ + for(bi = 0; bi < BPB && bi < (sb.size - b); bi++){ m = 1 << (bi % 8); if((bp->data[bi/8] & m) == 0){ // Is block free? bp->data[bi/8] |= m; // Mark block in use on disk.