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Btrfs: fix snprintf usage by send's gen_unique_name

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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>
This commit is contained in:
Filipe David Borba Manana 2014-01-21 23:36:38 +00:00 committed by Chris Mason
parent c41570c9d2
commit f74b86d855
1 changed files with 1 additions and 1 deletions
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2
fs/btrfs/send.c
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@ -1336,7 +1336,7 @@ static int gen_unique_name(struct send_ctx *sctx,
return -ENOMEM; return -ENOMEM;
while (1) { while (1) {
len = snprintf(tmp, sizeof(tmp) - 1, "o%llu-%llu-%llu", len = snprintf(tmp, sizeof(tmp), "o%llu-%llu-%llu",
ino, gen, idx); ino, gen, idx);
if (len >= sizeof(tmp)) { if (len >= sizeof(tmp)) {
/* should really not happen */ /* should really not happen */