Bug in libssh2_sftp_rename_ex

[ericpar]

libssh2_sftp_rename_ex fails for servers that implement
SFTP protocol version < 5. Furthermore, all SFTP
functions fail after a call to libssh2_sftp_rename_ex().

The problem is in the definition of the local variable
"packet_len" near the top of the function. It reserves
an extra 4 bytes for the rename flags, but these flags
are only used for SFTP version 5 or above. The code
that reads:

if (sftp->version >= 5) {

libssh2_htonu32(s, flags); s += 4;

}

never gets executed, thus "packet_len" and "s - packet"
differ by 4 bytes and the call to libssh2_channel_write
fails further in the function.

A simple fix is to change the definition of packet_len to:

unsigned long packet_len = source_filename_len +
dest_filename_len + 17;

/* packet_len(4) + packet_type(1) + request_id(4) +

source_filename_len(4) + dest_filename_len(4) */

and then add right below:

if (sftp->version >= 5) {

packet_len += 4; /* flags */

}

[sarag]

'twas fixed in Rel 0.12 (just now closing report)

Thanks