From: Aki Tuomi <aki.tuomi@open-xchange.com>
Date: Thu, 20 Aug 2020 13:24:41 +0000 (+0300)
Subject: quota: quota_free_bytes - Check we don't decrease more than INT64_MAX
X-Git-Tag: 2.3.13~190
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=bbca56c946487c537d2ab8fe781ad73eede195dd;p=thirdparty%2Fdovecot%2Fcore.git

quota: quota_free_bytes - Check we don't decrease more than INT64_MAX

Otherwise we get overflow
---

diff --git a/src/plugins/quota/quota.c b/src/plugins/quota/quota.c
index ee9debc407..1457ffe654 100644
--- a/src/plugins/quota/quota.c
+++ b/src/plugins/quota/quota.c
@@ -1460,7 +1460,8 @@ void quota_alloc(struct quota_transaction_context *ctx, struct mail *mail)
 void quota_free_bytes(struct quota_transaction_context *ctx,
 		      uoff_t physical_size)
 {
-	ctx->bytes_used -= physical_size;
+	i_assert(physical_size <= INT64_MAX);
+	ctx->bytes_used -= (int64_t)physical_size;
 	ctx->count_used--;
 }