From: Hugh Dickins <hugh@xxxxxxxxxxx> Port fix to the off-by-one in find_next_usable_block's memscan from ext2 to ext3; but it didn't cause a serious problem for ext3 because the additional ext3_test_allocatable check rescued it from the error. Signed-off-by: Mingming Cao <cmm@xxxxxxxxxx> Signed-off-by: Hugh Dickins <hugh@xxxxxxxxxxx> Cc: <linux-ext4@xxxxxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxx> --- fs/ext3/balloc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff -puN fs/ext3/balloc.c~ext3-balloc-fix-_with_rsv-freeze fs/ext3/balloc.c --- a/fs/ext3/balloc.c~ext3-balloc-fix-_with_rsv-freeze +++ a/fs/ext3/balloc.c @@ -730,7 +730,7 @@ find_next_usable_block(ext3_grpblk_t sta here = 0; p = ((char *)bh->b_data) + (here >> 3); - r = memscan(p, 0, (maxblocks - here + 7) >> 3); + r = memscan(p, 0, ((maxblocks + 7) >> 3) - (here >> 3)); next = (r - ((char *)bh->b_data)) << 3; if (next < maxblocks && next >= start && ext3_test_allocatable(next, bh)) _ - To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
