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authorJan Kara <jack@suse.cz>2008-12-03 17:31:39 +0100
committerJan Kara <jack@suse.cz>2009-04-02 12:29:52 +0200
commitf90981fed974759b5057c5a04299fe03d9dbf1d2 (patch)
tree7a794ae61ed947c4459259279c2b014f484a644e /fs
parent87bc730c07a0884d14d6af5c9d49f4669c0a0589 (diff)
udf: Add checks to not underflow sector_t
Signed-off-by: Jan Kara <jack@suse.cz>
Diffstat (limited to 'fs')
-rw-r--r--fs/udf/super.c21
1 files changed, 13 insertions, 8 deletions
diff --git a/fs/udf/super.c b/fs/udf/super.c
index b9dc6adfdd2..3c2d35dc257 100644
--- a/fs/udf/super.c
+++ b/fs/udf/super.c
@@ -731,13 +731,18 @@ static sector_t udf_scan_anchors(struct super_block *sb, sector_t lastblock)
sector_t last[6];
int i;
struct udf_sb_info *sbi = UDF_SB(sb);
-
- last[0] = lastblock;
- last[1] = last[0] - 1;
- last[2] = last[0] + 1;
- last[3] = last[0] - 2;
- last[4] = last[0] - 150;
- last[5] = last[0] - 152;
+ int last_count = 0;
+
+ last[last_count++] = lastblock;
+ if (lastblock >= 1)
+ last[last_count++] = lastblock - 1;
+ last[last_count++] = lastblock + 1;
+ if (lastblock >= 2)
+ last[last_count++] = lastblock - 2;
+ if (lastblock >= 150)
+ last[last_count++] = lastblock - 150;
+ if (lastblock >= 152)
+ last[last_count++] = lastblock - 152;
/* according to spec, anchor is in either:
* block 256
@@ -745,7 +750,7 @@ static sector_t udf_scan_anchors(struct super_block *sb, sector_t lastblock)
* lastblock
* however, if the disc isn't closed, it could be 512 */
- for (i = 0; i < ARRAY_SIZE(last); i++) {
+ for (i = 0; i < last_count; i++) {
if (last[i] >= sb->s_bdev->bd_inode->i_size >>
sb->s_blocksize_bits)
continue;