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sftp.c : discard and reset oversized packet in sftp_packet_read() (#269)

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file : sftp.c

notes : when sftp_packet_read() encounters an sftp packet which exceeds SFTP max packet size it now resets the reading state so it can continue reading.

credit : Zhen-Huan HWANG
This commit is contained in:
Zhen-Huan HWANG
2019-04-11 19:17:18 +02:00
committed by Will Cosgrove
parent dce4d8c742
commit 9ea7d3bced
1 changed files with 5 additions and 1 deletions
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6
src/sftp.c
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@@ -346,10 +346,14 @@ sftp_packet_read(LIBSSH2_SFTP *sftp)
sftp->partial_len = _libssh2_ntohu32(sftp->partial_size); sftp->partial_len = _libssh2_ntohu32(sftp->partial_size);
/* make sure we don't proceed if the packet size is unreasonably /* make sure we don't proceed if the packet size is unreasonably
large */ large */
if(sftp->partial_len > LIBSSH2_SFTP_PACKET_MAXLEN) if(sftp->partial_len > LIBSSH2_SFTP_PACKET_MAXLEN) {
libssh2_channel_flush(channel);
sftp->partial_size_len = 0;
return _libssh2_error(session, return _libssh2_error(session,
LIBSSH2_ERROR_CHANNEL_PACKET_EXCEEDED, LIBSSH2_ERROR_CHANNEL_PACKET_EXCEEDED,
"SFTP packet too large"); "SFTP packet too large");
}
if(sftp->partial_len == 0) if(sftp->partial_len == 0)
return _libssh2_error(session, return _libssh2_error(session,
LIBSSH2_ERROR_ALLOC, LIBSSH2_ERROR_ALLOC,