netdev - [PATCH iproute2 1/3] lib/fs: fix memory leak in get_task

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Tue,  1 Feb 2022 18:39:24 +0100
From:   Andrea Claudi <aclaudi@...hat.com>
To:     netdev@...r.kernel.org
Cc:     stephen@...workplumber.org, dsahern@...il.com,
        markzhang@...dia.com, leonro@...dia.com
Subject: [PATCH iproute2 1/3] lib/fs: fix memory leak in get_task_name()

asprintf() allocates memory which is not freed on the error path of
get_task_name(), thus potentially leading to memory leaks.

This commit fixes this using free() on error paths.

Fixes: 81bfd01a4c9e ("lib: move get_task_name() from rdma")
Signed-off-by: Andrea Claudi <aclaudi@...hat.com>
---
 lib/fs.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/lib/fs.c b/lib/fs.c
index f6f5f8a0..5692e2d3 100644
--- a/lib/fs.c
+++ b/lib/fs.c
@@ -354,11 +354,15 @@ char *get_task_name(pid_t pid)
 		return NULL;
 
 	f = fopen(comm, "r");
-	if (!f)
+	if (!f) {
+		free(comm);
 		return NULL;
+	}
 
-	if (fscanf(f, "%ms\n", &comm) != 1)
-		comm = NULL;
+	if (fscanf(f, "%ms\n", &comm) != 1) {
+		free(comm);
+		return NULL;
+	}
 
 	fclose(f);
 
-- 
2.34.1