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:
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.