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| author | Filipe David Borba Manana <fdmanana@gmail.com> | 2014-01-21 23:36:38 +0000 |
|---|---|---|
| committer | Chris Mason <clm@fb.com> | 2014-01-28 13:20:43 -0800 |
| commit | f74b86d85533a98ef7f573487af38f9dd514becb (patch) | |
| tree | 86ad2a4b8d7d39076c0df8789040ae0bc82287bf /fs/btrfs | |
| parent | c41570c9d29764f797fa35490d72b7395a0105c3 (diff) | |
| download | linux-f74b86d85533a98ef7f573487af38f9dd514becb.tar.gz linux-f74b86d85533a98ef7f573487af38f9dd514becb.tar.bz2 linux-f74b86d85533a98ef7f573487af38f9dd514becb.zip | |
Btrfs: fix snprintf usage by send's gen_unique_name
The buffer size argument passed to snprintf must account for the
trailing null byte added by snprintf, and it returns a value >= then
sizeof(buffer) when the string can't fit in the buffer.
Since our buffer has a size of 64 characters, and the maximum orphan
name we can generate is 63 characters wide, we must pass 64 as the
buffer size to snprintf, and not 63.
Signed-off-by: Filipe David Borba Manana <fdmanana@gmail.com>
Reviewed-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: Chris Mason <clm@fb.com>
Diffstat (limited to 'fs/btrfs')
| -rw-r--r-- | fs/btrfs/send.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/btrfs/send.c b/fs/btrfs/send.c index aa60cbe7066c..fc1f0abb8fe4 100644 --- a/fs/btrfs/send.c +++ b/fs/btrfs/send.c @@ -1336,7 +1336,7 @@ static int gen_unique_name(struct send_ctx *sctx, return -ENOMEM; while (1) { - len = snprintf(tmp, sizeof(tmp) - 1, "o%llu-%llu-%llu", + len = snprintf(tmp, sizeof(tmp), "o%llu-%llu-%llu", ino, gen, idx); if (len >= sizeof(tmp)) { /* should really not happen */ |