From: Aki Tuomi <aki.tuomi@dovecot.fi>
Date: Mon, 19 Dec 2016 10:16:20 +0000 (+0200)
Subject: lib-index: Make sure buffer is not null before freeing
X-Git-Tag: 2.3.0.rc1~2389
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=261c0ffe765bcd5c654f7c85f5874baea870a8a5;p=thirdparty%2Fdovecot%2Fcore.git

lib-index: Make sure buffer is not null before freeing

Fixes signal 11 crash under stress.
---

diff --git a/src/lib-index/mail-transaction-log-file.c b/src/lib-index/mail-transaction-log-file.c
index a5da3966fb..5cc9f60208 100644
--- a/src/lib-index/mail-transaction-log-file.c
+++ b/src/lib-index/mail-transaction-log-file.c
@@ -950,7 +950,8 @@ int mail_transaction_log_file_open(struct mail_transaction_log_file *file,
 		}
 
 		/* ESTALE - try again */
-		buffer_free(&file->buffer);
+		if (file->buffer != NULL)
+			buffer_free(&file->buffer);
         }
 
 	mail_transaction_log_file_add_to_list(file);