File session-Fix-buffer-overflow-in-ipmi_get_session_info.patch of Package ipmitool.14091

From: Chrostoper Ertl <chertl@microsoft.com>
Subject: session: Fix buffer overflow in ipmi_get_session_info
References: bsc#1163026, CVE-2020-5208
Patch-Mainline: 
Git-commit: 41d7026946fafbd4d1ec0bcaca3ea30a6e8eed22
Git-repo: https://github.com/ipmitool/ipmitool.git.git

Partial fix for CVE-2020-5208, see
https://github.com/ipmitool/ipmitool/security/advisories/GHSA-g659-9qxw-p7cp

The `ipmi_get_session_info` function does not properly check the
response `data_len`, which is used as a copy size, allowing stack buffer
overflow.


Signed-off-by:  <trenn@suse.com>
diff --git a/lib/ipmi_session.c b/lib/ipmi_session.c
index ecf4afc..b282d6d 100644
--- a/lib/ipmi_session.c
+++ b/lib/ipmi_session.c
@@ -309,8 +309,10 @@ ipmi_get_session_info(struct ipmi_intf         * intf,
 		}
 		else
 		{
-			memcpy(&session_info,  rsp->data, rsp->data_len);
-			print_session_info(&session_info, rsp->data_len);
+			memcpy(&session_info,  rsp->data,
+			       __min(rsp->data_len, sizeof(session_info)));
+			print_session_info(&session_info,
+			                   __min(rsp->data_len, sizeof(session_info)));
 		}
 		break;
 		
@@ -341,8 +343,10 @@ ipmi_get_session_info(struct ipmi_intf         * intf,
 				break;
 			}
 
-			memcpy(&session_info,  rsp->data, rsp->data_len);
-			print_session_info(&session_info, rsp->data_len);
+			memcpy(&session_info,  rsp->data,
+			       __min(rsp->data_len, sizeof(session_info)));
+			print_session_info(&session_info,
+			                   __min(rsp->data_len, sizeof(session_info)));
 			
 		} while (i <= session_info.session_slot_count);
 		break;