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btrfs-progs: dump-super: detect invalid checksum type

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The helper btrfs_super_csum_size unconditionally bugs on a bogus value,
the dump-super is supposed to dump even corrupted superblocks so this
must not happen here. Group the checsum values in the output and be more
robust agains garbage values.

Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2016-09-01 19:54:04 +02:00
parent df96f8244d
commit ee7bb45ddc
1 changed files with 20 additions and 6 deletions
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26
cmds-inspect-dump-super.c
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@ -287,11 +287,29 @@ static void dump_superblock(struct btrfs_super_block *sb, int full)
int i;
char *s, buf[BTRFS_UUID_UNPARSED_SIZE];
u8 *p;
u32 csum_size;
u16 csum_type;
csum_type = btrfs_super_csum_type(sb);
csum_size = BTRFS_CSUM_SIZE;
printf("csum_type\t\t%hu (", csum_type);
if (csum_type >= ARRAY_SIZE(btrfs_csum_sizes)) {
printf("INVALID");
} else {
if (csum_type == BTRFS_CSUM_TYPE_CRC32) {
printf("crc32c");
csum_size = btrfs_csum_sizes[csum_type];
} else {
printf("unknown");
}
}
printf(")\n");
printf("csum_size\t\t%llu\n", (unsigned long long)csum_size);
printf("csum\t\t\t0x");
for (i = 0, p = sb->csum; i < btrfs_super_csum_size(sb); i++)
for (i = 0, p = sb->csum; i < csum_size; i++)
printf("%02x", p[i]);
if (check_csum_sblock(sb, btrfs_super_csum_size(sb)))
if (check_csum_sblock(sb, csum_size))
printf(" [match]");
else
printf(" [DON'T MATCH]");
@ -363,10 +381,6 @@ static void dump_superblock(struct btrfs_super_block *sb, int full)
printf("incompat_flags\t\t0x%llx\n",
(unsigned long long)btrfs_super_incompat_flags(sb));
print_readable_incompat_flag(btrfs_super_incompat_flags(sb));
printf("csum_type\t\t%llu\n",
(unsigned long long)btrfs_super_csum_type(sb));
printf("csum_size\t\t%llu\n",
(unsigned long long)btrfs_super_csum_size(sb));
printf("cache_generation\t%llu\n",
(unsigned long long)btrfs_super_cache_generation(sb));
printf("uuid_tree_generation\t%llu\n",