qemu-kvm/SOURCES/kvm-Don-t-leak-memory-when-reallocation-fails.patch

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From bcb6107f98d7b1edf687d7afd552a4528b7e673b Mon Sep 17 00:00:00 2001
From: jmaloy <jmaloy@redhat.com>
Date: Tue, 12 May 2020 21:15:13 +0100
Subject: [PATCH 2/7] Don't leak memory when reallocation fails.
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
RH-Author: jmaloy <jmaloy@redhat.com>
Message-id: <20200512211514.1398384-2-jmaloy@redhat.com>
Patchwork-id: 96412
O-Subject: [RHEL-AV-8.2.1 qemu-kvm PATCH 1/2] Don't leak memory when reallocation fails.
Bugzilla: 1749737
RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
RH-Acked-by: Thomas Huth <thuth@redhat.com>
RH-Acked-by: Philippe Mathieu-Daudé <philmd@redhat.com>
From: Jindrich Novy <jnovy@redhat.com>
Signed-off-by: Jindrich Novy <jnovy@redhat.com>
[ Marc-André - modified to use a temporary variable ]
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
(cherry picked from libslirp commit d171af3732a0610a25334b06b77fa547bd677918)
Signed-off-by: Jon Maloy <jmaloy@redhat.com>
Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
---
slirp/src/sbuf.c | 11 +++++++----
1 file changed, 7 insertions(+), 4 deletions(-)
diff --git a/slirp/src/sbuf.c b/slirp/src/sbuf.c
index abced48..0569c34 100644
--- a/slirp/src/sbuf.c
+++ b/slirp/src/sbuf.c
@@ -39,13 +39,16 @@ void sbreserve(struct sbuf *sb, int size)
if (sb->sb_data) {
/* Already alloced, realloc if necessary */
if (sb->sb_datalen != size) {
- sb->sb_wptr = sb->sb_rptr = sb->sb_data =
- (char *)realloc(sb->sb_data, size);
+ char *new = realloc(sb->sb_data, size);
sb->sb_cc = 0;
- if (sb->sb_wptr)
+ if (new) {
+ sb->sb_data = sb->sb_wptr = sb->sb_rptr = new;
sb->sb_datalen = size;
- else
+ } else {
+ free(sb->sb_data);
+ sb->sb_data = sb->sb_wptr = sb->sb_rptr = NULL;
sb->sb_datalen = 0;
+ }
}
} else {
sb->sb_wptr = sb->sb_rptr = sb->sb_data = (char *)malloc(size);
--
1.8.3.1