From: Victor Julien <vjulien@oisf.net>
Date: Tue, 28 Jun 2022 13:29:25 +0000 (+0200)
Subject: mime: fix corner case
X-Git-Tag: suricata-5.0.10~3
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7b18cdf16296df20578790c719a7d1240debd147;p=thirdparty%2Fsuricata.git

mime: fix corner case

Fix a corner case where a base64 sequence including a space was followed
by a newline in the input data.

(cherry picked from commit d81582c4a2b5b9cd6000c8637a7c6bc9b8f4dfd6)
---

diff --git a/src/util-decode-mime.c b/src/util-decode-mime.c
index 66b22bb87c..457e3e9da0 100644
--- a/src/util-decode-mime.c
+++ b/src/util-decode-mime.c
@@ -1236,6 +1236,9 @@ static uint8_t ProcessBase64Remainder(
             memcpy(state->bvremain, block, cnt);
         }
         state->bvr_len = cnt;
+    } else if (!force && cnt != B64_BLOCK) {
+        SCLogDebug("incomplete data and no buffer to backfill");
+        return 0;
     }
 
     /* in force mode pad the block */