From ff53664f540517a6e7c634ae9cc804d168a9e9a8 Mon Sep 17 00:00:00 2001
From: Andreas Schneider <asn@cryptomilk.org>
Date: Sun, 7 Oct 2012 22:03:35 +0200
Subject: sftp: Fix a possible null pointer dereference in sftp_async_read.

---
 src/sftp.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

(limited to 'src')

diff --git a/src/sftp.c b/src/sftp.c
index 60afdc2f..835588e2 100644
--- a/src/sftp.c
+++ b/src/sftp.c
@@ -1834,13 +1834,18 @@ int sftp_async_read_begin(sftp_file file, uint32_t len){
 
 /* Wait for an asynchronous read to complete and save the data. */
 int sftp_async_read(sftp_file file, void *data, uint32_t size, uint32_t id){
-  sftp_session sftp = file->sftp;
+  sftp_session sftp;
   sftp_message msg = NULL;
   sftp_status_message status;
   ssh_string datastring;
   int err = SSH_OK;
   uint32_t len;
 
+  if (file == NULL) {
+    return SSH_ERROR;
+  }
+  sftp = file->sftp;
+
   if (file->eof) {
     return 0;
   }
-- 
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