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| author | Jan Kara <jack@suse.cz> | 2008-12-03 17:31:39 +0100 |
|---|---|---|
| committer | Jan Kara <jack@suse.cz> | 2009-04-02 12:29:52 +0200 |
| commit | f90981fed974759b5057c5a04299fe03d9dbf1d2 (patch) | |
| tree | 7a794ae61ed947c4459259279c2b014f484a644e /fs/udf | |
| parent | 87bc730c07a0884d14d6af5c9d49f4669c0a0589 (diff) | |
| download | lwn-f90981fed974759b5057c5a04299fe03d9dbf1d2.tar.gz lwn-f90981fed974759b5057c5a04299fe03d9dbf1d2.zip | |
udf: Add checks to not underflow sector_t
Signed-off-by: Jan Kara <jack@suse.cz>
Diffstat (limited to 'fs/udf')
| -rw-r--r-- | 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 b9dc6adfdd2d..3c2d35dc2577 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; |