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rbd: don't over-allocate space for object prefix

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In rbd_header_from_disk() the object prefix buffer is sized based on
the maximum size it's block_name equivalent on disk could be.

Instead, only allocate enough to hold null-terminated string from
the on-disk header--or the maximum size of no NUL is found.

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Yehuda Sadeh <yehuda@inktank.com>
This commit is contained in:
Alex Elder 2012-08-23 23:22:06 -05:00
parent 1f7ba33115
commit 58c17b0e1b
1 changed files with 5 additions and 4 deletions
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9
drivers/block/rbd.c
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@ -519,18 +519,19 @@ static int rbd_header_from_disk(struct rbd_image_header *header,
struct rbd_image_header_ondisk *ondisk)
{
u32 snap_count;
size_t len;
size_t size;
memset(header, 0, sizeof (*header));
snap_count = le32_to_cpu(ondisk->snap_count);
size = sizeof (ondisk->object_prefix) + 1;
header->object_prefix = kmalloc(size, GFP_KERNEL);
len = strnlen(ondisk->object_prefix, sizeof (ondisk->object_prefix));
header->object_prefix = kmalloc(len + 1, GFP_KERNEL);
if (!header->object_prefix)
return -ENOMEM;
memcpy(header->object_prefix, ondisk->object_prefix, size - 1);
header->object_prefix[size - 1] = '\0';
memcpy(header->object_prefix, ondisk->object_prefix, len);
header->object_prefix[len] = '\0';
if (snap_count) {
header->snap_names_len = le64_to_cpu(ondisk->snap_names_len);