lkml.org 
[lkml]   [2022]   [Jan]   [24]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 5.10 227/563] ax25: uninitialized variable in ax25_setsockopt()
Date
From: Dan Carpenter <dan.carpenter@oracle.com>

[ Upstream commit 9371937092d5fd502032c1bb4475b36b39b1f1b3 ]

The "opt" variable is unsigned long but we only copy 4 bytes from
the user so the lower 4 bytes are uninitialized.

I have changed the integer overflow checks from ULONG to UINT as well.
This is a slight API change but I don't expect it to break anything.

Fixes: a7b75c5a8c41 ("net: pass a sockptr_t into ->setsockopt")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
net/ax25/af_ax25.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/net/ax25/af_ax25.c b/net/ax25/af_ax25.c
index 22278807b3f36..5e84dce5ff7ae 100644
--- a/net/ax25/af_ax25.c
+++ b/net/ax25/af_ax25.c
@@ -536,7 +536,7 @@ static int ax25_setsockopt(struct socket *sock, int level, int optname,
ax25_cb *ax25;
struct net_device *dev;
char devname[IFNAMSIZ];
- unsigned long opt;
+ unsigned int opt;
int res = 0;

if (level != SOL_AX25)
@@ -568,7 +568,7 @@ static int ax25_setsockopt(struct socket *sock, int level, int optname,
break;

case AX25_T1:
- if (opt < 1 || opt > ULONG_MAX / HZ) {
+ if (opt < 1 || opt > UINT_MAX / HZ) {
res = -EINVAL;
break;
}
@@ -577,7 +577,7 @@ static int ax25_setsockopt(struct socket *sock, int level, int optname,
break;

case AX25_T2:
- if (opt < 1 || opt > ULONG_MAX / HZ) {
+ if (opt < 1 || opt > UINT_MAX / HZ) {
res = -EINVAL;
break;
}
@@ -593,7 +593,7 @@ static int ax25_setsockopt(struct socket *sock, int level, int optname,
break;

case AX25_T3:
- if (opt < 1 || opt > ULONG_MAX / HZ) {
+ if (opt < 1 || opt > UINT_MAX / HZ) {
res = -EINVAL;
break;
}
@@ -601,7 +601,7 @@ static int ax25_setsockopt(struct socket *sock, int level, int optname,
break;

case AX25_IDLE:
- if (opt > ULONG_MAX / (60 * HZ)) {
+ if (opt > UINT_MAX / (60 * HZ)) {
res = -EINVAL;
break;
}
--
2.34.1


\
 
 \ /
  Last update: 2022-09-17 16:14    [W:1.973 / U:0.180 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site