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From f06cf3a20dc3f54b7a9fc8127eb7719462caab39 Mon Sep 17 00:00:00 2001
From: Kamil Dudka <kdudka@redhat.com>
Date: Tue, 19 Mar 2019 13:32:05 +0100
Subject: [PATCH] Resolves: CVE-2019-3858 - fix zero-byte allocation
... with a specially crafted SFTP packet leading to an out-of-bounds read
Upstream-Patch: https://libssh2.org/1.8.0-CVE/CVE-2019-3858.patch
---
src/sftp.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/src/sftp.c b/src/sftp.c
index 7c44116..65cef85 100644
--- a/src/sftp.c
+++ b/src/sftp.c
@@ -345,6 +345,10 @@ sftp_packet_read(LIBSSH2_SFTP *sftp)
return _libssh2_error(session,
LIBSSH2_ERROR_CHANNEL_PACKET_EXCEEDED,
"SFTP packet too large");
+ if (sftp->partial_len == 0)
+ return _libssh2_error(session,
+ LIBSSH2_ERROR_ALLOC,
+ "Unable to allocate empty SFTP packet");
_libssh2_debug(session, LIBSSH2_TRACE_SFTP,
"Data begin - Packet Length: %lu",
--
2.17.2
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