Gitweb: http://git.kernel.org/linus/f90981fed974759b5057c5a04299fe03d9dbf1d2
Commit: f90981fed974759b5057c5a04299fe03d9dbf1d2
Parent: 87bc730c07a0884d14d6af5c9d49f4669c0a0589
Author: Jan Kara <jack@suse.cz>
AuthorDate: Wed Dec 3 17:31:39 2008 +0100
Committer: Jan Kara <jack@suse.cz>
CommitDate: Thu Apr 2 12:29:52 2009 +0200
udf: Add checks to not underflow sector_t
Signed-off-by: Jan Kara <jack@suse.cz>
---
fs/udf/super.c | 21 +++++++++++++--------
1 files changed, 13 insertions(+), 8 deletions(-)
diff --git a/fs/udf/super.c b/fs/udf/super.c
index b9dc6ad..3c2d35d 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;
--
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