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btrfs-progs: receive: properly detect end of stream conditions

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Read buffer helper mistakenly reported end of data as an error. Next, we
have to check if the first stream exists as an empty file is not a valid
stream.

Reported-by: Tsutomu Itoh <t-itoh@jp.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2016-11-29 16:07:19 +01:00
parent d960f81d8e
commit 71f220034d
2 changed files with 10 additions and 1 deletions
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9
cmds-receive.c
View File

@ -1061,6 +1061,7 @@ static int do_receive(struct btrfs_receive *r, const char *tomnt,
char *dest_dir_full_path;
char root_subvol_path[PATH_MAX];
int end = 0;
int count;
dest_dir_full_path = realpath(tomnt, NULL);
if (!dest_dir_full_path) {
@ -1155,6 +1156,7 @@ static int do_receive(struct btrfs_receive *r, const char *tomnt,
if (ret < 0)
goto out;
count = 0;
while (!end) {
if (r->cached_capabilities_len) {
if (g_verbose >= 3)
@ -1169,6 +1171,13 @@ static int do_receive(struct btrfs_receive *r, const char *tomnt,
max_errors);
if (ret < 0)
goto out;
/* Empty stream is invalid */
if (ret && count == 0) {
error("empty stream is not considered valid");
ret = -EINVAL;
goto out;
}
count++;
if (ret)
end = 1;

2
send-stream.c
View File

@ -74,7 +74,7 @@ static int read_buf(struct btrfs_send_stream *sctx, char *buf, size_t len)
ret = 0;
out_eof:
if (pos < len) {
if (0 < pos && pos < len) {
error("short read from stream: expected %zu read %zu", len, pos);
ret = -EIO;
} else {