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authorTimo Warns <warns@pre-sense.de>2011-02-17 22:27:40 +0100
committerGreg Kroah-Hartman <gregkh@suse.de>2011-03-21 12:45:11 -0700
commit9cab3cdd60c929dfe4c5ce641a2530fe8b27a89d (patch)
tree602b6a5d6249be57489d1bf07f02877f9b117684 /fs
parent92a79fb1843f5af48a7d80efde9852450e2ecc5f (diff)
fs/partitions: Validate map_count in Mac partition tables
commit fa7ea87a057958a8b7926c1a60a3ca6d696328ed upstream. Validate number of blocks in map and remove redundant variable. Signed-off-by: Timo Warns <warns@pre-sense.de> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'fs')
-rw-r--r--fs/partitions/mac.c17
1 files changed, 9 insertions, 8 deletions
diff --git a/fs/partitions/mac.c b/fs/partitions/mac.c
index d4a0fad3563b..5765198e9228 100644
--- a/fs/partitions/mac.c
+++ b/fs/partitions/mac.c
@@ -29,10 +29,9 @@ static inline void mac_fix_string(char *stg, int len)
int mac_partition(struct parsed_partitions *state, struct block_device *bdev)
{
- int slot = 1;
Sector sect;
unsigned char *data;
- int blk, blocks_in_map;
+ int slot, blocks_in_map;
unsigned secsize;
#ifdef CONFIG_PPC_PMAC
int found_root = 0;
@@ -59,10 +58,14 @@ int mac_partition(struct parsed_partitions *state, struct block_device *bdev)
put_dev_sector(sect);
return 0; /* not a MacOS disk */
}
- printk(" [mac]");
blocks_in_map = be32_to_cpu(part->map_count);
- for (blk = 1; blk <= blocks_in_map; ++blk) {
- int pos = blk * secsize;
+ if (blocks_in_map < 0 || blocks_in_map >= DISK_MAX_PARTS) {
+ put_dev_sector(sect);
+ return 0;
+ }
+ printk(" [mac]");
+ for (slot = 1; slot <= blocks_in_map; ++slot) {
+ int pos = slot * secsize;
put_dev_sector(sect);
data = read_dev_sector(bdev, pos/512, &sect);
if (!data)
@@ -113,13 +116,11 @@ int mac_partition(struct parsed_partitions *state, struct block_device *bdev)
}
if (goodness > found_root_goodness) {
- found_root = blk;
+ found_root = slot;
found_root_goodness = goodness;
}
}
#endif /* CONFIG_PPC_PMAC */
-
- ++slot;
}
#ifdef CONFIG_PPC_PMAC
if (found_root_goodness)