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| author | Thomas Frauendorfer <tf@miray.de> | 2019-03-05 17:04:34 +0100 |
|---|---|---|
| committer | Denys Vlasenko <vda.linux@googlemail.com> | 2019-03-15 09:57:24 +0100 |
| commit | 2bbd1e1e8ababc480ff5d373847ab98ba0cc23dd (patch) | |
| tree | e799612ffde8f738f127db38aaa728a7a3616617 /util-linux | |
| parent | 0ddc742c04538fdd8be51fb1d4dbcbd4309952db (diff) | |
| download | busybox-2bbd1e1e8ababc480ff5d373847ab98ba0cc23dd.tar.gz | |
Fix off by one error in FAT16 <=> FAT32 detection
cluster_count is compared against FAT16_MAX, which is defined as 0xfff4
That is the maximum number of cluster a FAT16 can have.
For reference also check the hardware whitepaper from Microsoft
FAT: General Overview of On-Disk Format, version 1.03 page 15
Signed-off-by: Thomas Frauendorfer <tf@miray.de>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'util-linux')
| -rw-r--r-- | util-linux/volume_id/fat.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/util-linux/volume_id/fat.c b/util-linux/volume_id/fat.c index b24ed098e..fe3750880 100644 --- a/util-linux/volume_id/fat.c +++ b/util-linux/volume_id/fat.c @@ -247,7 +247,7 @@ int FAST_FUNC volume_id_probe_vfat(struct volume_id *id /*,uint64_t fat_partitio // strcpy(id->type_version, "FAT32"); // goto fat32; // } - if (cluster_count >= FAT16_MAX) + if (cluster_count > FAT16_MAX) goto fat32; /* the label may be an attribute in the root directory */ |