From: Daniel Stenberg <daniel@haxx.se>
Date: Thu, 25 Sep 2025 14:38:49 +0000 (+0200)
Subject: libssh: acknowledge SSH_AGAIN in the SFTP state machine
X-Git-Tag: rc-8_17_0-1~223
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=b8f10be4f205665552a2dfd276889896e0c3116b;p=thirdparty%2Fcurl.git

libssh: acknowledge SSH_AGAIN in the SFTP state machine

Reported in Joshua's sarif data

Closes #18740
---

diff --git a/lib/vssh/libssh.c b/lib/vssh/libssh.c
index e1e660b4b3..0f51137e8c 100644
--- a/lib/vssh/libssh.c
+++ b/lib/vssh/libssh.c
@@ -1959,6 +1959,8 @@ static CURLcode myssh_statemach_act(struct Curl_easy *data,
     case SSH_SFTP_QUOTE_SETSTAT:
       rc = sftp_setstat(sshc->sftp_session, sshc->quote_path2,
                         sshc->quote_attrs);
+      if(rc == SSH_AGAIN)
+        break;
       if(rc && !sshc->acceptfail) {
         Curl_safefree(sshc->quote_path1);
         Curl_safefree(sshc->quote_path2);
@@ -1978,6 +1980,8 @@ static CURLcode myssh_statemach_act(struct Curl_easy *data,
     case SSH_SFTP_QUOTE_SYMLINK:
       rc = sftp_symlink(sshc->sftp_session, sshc->quote_path2,
                         sshc->quote_path1);
+      if(rc == SSH_AGAIN)
+        break;
       if(rc && !sshc->acceptfail) {
         Curl_safefree(sshc->quote_path1);
         Curl_safefree(sshc->quote_path2);
@@ -1994,6 +1998,8 @@ static CURLcode myssh_statemach_act(struct Curl_easy *data,
     case SSH_SFTP_QUOTE_MKDIR:
       rc = sftp_mkdir(sshc->sftp_session, sshc->quote_path1,
                       (mode_t)data->set.new_directory_perms);
+      if(rc == SSH_AGAIN)
+        break;
       if(rc && !sshc->acceptfail) {
         Curl_safefree(sshc->quote_path1);
         failf(data, "mkdir command failed: %s",
@@ -2009,6 +2015,8 @@ static CURLcode myssh_statemach_act(struct Curl_easy *data,
     case SSH_SFTP_QUOTE_RENAME:
       rc = sftp_rename(sshc->sftp_session, sshc->quote_path1,
                        sshc->quote_path2);
+      if(rc == SSH_AGAIN)
+        break;
       if(rc && !sshc->acceptfail) {
         Curl_safefree(sshc->quote_path1);
         Curl_safefree(sshc->quote_path2);
@@ -2024,6 +2032,8 @@ static CURLcode myssh_statemach_act(struct Curl_easy *data,
 
     case SSH_SFTP_QUOTE_RMDIR:
       rc = sftp_rmdir(sshc->sftp_session, sshc->quote_path1);
+      if(rc == SSH_AGAIN)
+        break;
       if(rc && !sshc->acceptfail) {
         Curl_safefree(sshc->quote_path1);
         failf(data, "rmdir command failed: %s",
@@ -2038,6 +2048,8 @@ static CURLcode myssh_statemach_act(struct Curl_easy *data,
 
     case SSH_SFTP_QUOTE_UNLINK:
       rc = sftp_unlink(sshc->sftp_session, sshc->quote_path1);
+      if(rc == SSH_AGAIN)
+        break;
       if(rc && !sshc->acceptfail) {
         Curl_safefree(sshc->quote_path1);
         failf(data, "rm command failed: %s",