[dpdk-stable] [PATCH 1/2] vhost: fix memory leak on realloc failure

[dpdk-stable] [PATCH 1/2] vhost: fix memory leak on realloc failure

[Tiwei Bie]

When realloc() fails, the original block isn't freed.

Fixes: e246896178e6 ("vhost: get guest/host physical address mappings")
Cc: stable@dpdk.org

Signed-off-by: Tiwei Bie <tiwei.bie@intel.com>
---
 lib/librte_vhost/vhost_user.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lib/librte_vhost/vhost_user.c b/lib/librte_vhost/vhost_user.c
index 8fec773d5..5222f77dd 100644
--- a/lib/librte_vhost/vhost_user.c
+++ b/lib/librte_vhost/vhost_user.c
@@ -730,13 +730,16 @@ add_one_guest_page(struct virtio_net *dev, uint64_t guest_phys_addr,
 		   uint64_t host_phys_addr, uint64_t size)
 {
 	struct guest_page *page, *last_page;
+	struct guest_page *old_pages;
 
 	if (dev->nr_guest_pages == dev->max_guest_pages) {
 		dev->max_guest_pages *= 2;
+		old_pages = dev->guest_pages;
 		dev->guest_pages = realloc(dev->guest_pages,
 					dev->max_guest_pages * sizeof(*page));
 		if (!dev->guest_pages) {
 			RTE_LOG(ERR, VHOST_CONFIG, "cannot realloc guest_pages\n");
+			free(old_pages);
 			return -1;
 		}
 	}
-- 
2.17.1

Re: [dpdk-stable] [PATCH 1/2] vhost: fix memory leak on realloc failure

[Maxime Coquelin]

On 1/14/19 4:34 AM, Tiwei Bie wrote:
> When realloc() fails, the original block isn't freed.
> 
> Fixes: e246896178e6 ("vhost: get guest/host physical address mappings")
> Cc: stable@dpdk.org
> 
> Signed-off-by: Tiwei Bie <tiwei.bie@intel.com>
> ---
>   lib/librte_vhost/vhost_user.c | 3 +++
>   1 file changed, 3 insertions(+)
> 


Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>

Thanks,
Maxime

[dpdk-stable] [PATCH 2/2] examples/vhost: fix realloc failure

[Tiwei Bie]

Fixes: ad0eef4d2203 ("examples/vhost: support multiple socket files")
Cc: stable@dpdk.org

Signed-off-by: Tiwei Bie <tiwei.bie@intel.com>
---
 examples/vhost/main.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/examples/vhost/main.c b/examples/vhost/main.c
index dc9ea1018..23fee445a 100644
--- a/examples/vhost/main.c
+++ b/examples/vhost/main.c
@@ -375,11 +375,19 @@ port_init(uint16_t port)
 static int
 us_vhost_parse_socket_path(const char *q_arg)
 {
+	char *old;
+
 	/* parse number string */
 	if (strnlen(q_arg, PATH_MAX) == PATH_MAX)
 		return -1;
 
+	old = socket_files;
 	socket_files = realloc(socket_files, PATH_MAX * (nb_sockets + 1));
+	if (socket_files == NULL) {
+		free(old);
+		return -1;
+	}
+
 	snprintf(socket_files + nb_sockets * PATH_MAX, PATH_MAX, "%s", q_arg);
 	nb_sockets++;
 
-- 
2.17.1

Re: [dpdk-stable] [PATCH 2/2] examples/vhost: fix realloc failure

[Maxime Coquelin]

On 1/14/19 4:34 AM, Tiwei Bie wrote:
> Fixes: ad0eef4d2203 ("examples/vhost: support multiple socket files")
> Cc: stable@dpdk.org
> 
> Signed-off-by: Tiwei Bie <tiwei.bie@intel.com>
> ---
>   examples/vhost/main.c | 8 ++++++++
>   1 file changed, 8 insertions(+)
> 

Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>

Thanks,
Maxime

Re: [dpdk-stable] [PATCH 2/2] examples/vhost: fix realloc failure

[Thomas Monjalon]

14/01/2019 04:34, Tiwei Bie:
> Fixes: ad0eef4d2203 ("examples/vhost: support multiple socket files")
> Cc: stable@dpdk.org

Please add some explanations about what was wrong.

About the title, do you mean "fix path allocation failure handling" ?

Re: [dpdk-stable] [PATCH 2/2] examples/vhost: fix realloc failure

[Tiwei Bie]

On Tue, Jan 15, 2019 at 02:56:39AM +0100, Thomas Monjalon wrote:
> 14/01/2019 04:34, Tiwei Bie:
> > Fixes: ad0eef4d2203 ("examples/vhost: support multiple socket files")
> > Cc: stable@dpdk.org
> 
> Please add some explanations about what was wrong.

My bad. Will do it in the next version.

> 
> About the title, do you mean "fix path allocation failure handling" ?

Yeah, thanks for the suggestion!

Thanks