diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
index 18980472f5b0..045646da97cc 100644
--- a/kernel/bpf/syscall.c
+++ b/kernel/bpf/syscall.c
@@ -410,14 +410,11 @@ static int map_lookup_elem(union bpf_attr *attr)
if (IS_ERR(map))
return PTR_ERR(map);
- err = -ENOMEM;
- key = kmalloc(map->key_size, GFP_USER);
- if (!key)
+ key = memdup_user(ukey, map->key_size);
+ if (IS_ERR(key)) {
+ err = PTR_ERR(key);
goto err_put;
-
- err = -EFAULT;
- if (copy_from_user(key, ukey, map->key_size) != 0)
- goto free_key;
+ }
if (map->map_type == BPF_MAP_TYPE_PERCPU_HASH ||
map->map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH ||
@@ -493,14 +490,11 @@ static int map_update_elem(union bpf_attr *attr)
if (IS_ERR(map))
return PTR_ERR(map);
- err = -ENOMEM;
- key = kmalloc(map->key_size, GFP_USER);
- if (!key)
+ key = memdup_user(ukey, map->key_size);
+ if (IS_ERR(key)) {
+ err = PTR_ERR(key);
goto err_put;
-
- err = -EFAULT;
- if (copy_from_user(key, ukey, map->key_size) != 0)
- goto free_key;
+ }
if (map->map_type == BPF_MAP_TYPE_PERCPU_HASH ||
map->map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH ||
@@ -579,14 +573,11 @@ static int map_delete_elem(union bpf_attr *attr)
if (IS_ERR(map))
return PTR_ERR(map);
- err = -ENOMEM;
- key = kmalloc(map->key_size, GFP_USER);
- if (!key)
+ key = memdup_user(ukey, map->key_size);
+ if (IS_ERR(key)) {
+ err = PTR_ERR(key);
goto err_put;
-
- err = -EFAULT;
- if (copy_from_user(key, ukey, map->key_size) != 0)
- goto free_key;
+ }
preempt_disable();
__this_cpu_inc(bpf_prog_active);
@@ -598,7 +589,6 @@ static int map_delete_elem(union bpf_attr *attr)
if (!err)
trace_bpf_map_delete_elem(map, ufd, key);
-free_key:
kfree(key);
err_put:
fdput(f);
@@ -627,14 +617,11 @@ static int map_get_next_key(union bpf_attr *attr)
return PTR_ERR(map);
if (ukey) {
- err = -ENOMEM;
- key = kmalloc(map->key_size, GFP_USER);
- if (!key)
+ key = memdup_user(ukey, map->key_size);
+ if (IS_ERR(key)) {
+ err = PTR_ERR(key);
goto err_put;
-
- err = -EFAULT;
- if (copy_from_user(key, ukey, map->key_size) != 0)
- goto free_key;
+ }
} else {
key = NULL;
}
diff --git a/kernel/kexec_file.c b/kernel/kexec_file.c
index b118735fea9d..766e7e4d3ad9 100644
--- a/kernel/kexec_file.c
+++ b/kernel/kexec_file.c
@@ -162,16 +162,10 @@ kimage_file_prepare_segments(struct kimage *image, int kernel_fd, int initrd_fd,
}
if (cmdline_len) {
- image->cmdline_buf = kzalloc(cmdline_len, GFP_KERNEL);
- if (!image->cmdline_buf) {
- ret = -ENOMEM;
- goto out;
- }
-
- ret = copy_from_user(image->cmdline_buf, cmdline_ptr,
- cmdline_len);
- if (ret) {
- ret = -EFAULT;
+ image->cmdline_buf = memdup_user(cmdline_ptr, cmdline_len);
+ if (IS_ERR(image->cmdline_buf)) {
+ ret = PTR_ERR(image->cmdline_buf);
+ image->cmdline_buf = NULL;
goto out;
}
diff --git a/net/core/ethtool.c b/net/core/ethtool.c
index 03111a2d6653..674b6c9cec18 100644
--- a/net/core/ethtool.c
+++ b/net/core/ethtool.c
@@ -2322,16 +2322,12 @@ static int ethtool_set_tunable(struct net_device *dev, void __user *useraddr)
ret = ethtool_tunable_valid(&tuna);
if (ret)
return ret;
- data = kmalloc(tuna.len, GFP_USER);
- if (!data)
- return -ENOMEM;
useraddr += sizeof(tuna);
- ret = -EFAULT;
- if (copy_from_user(data, useraddr, tuna.len))
- goto out;
+ data = memdup_user(useraddr, tuna.len);
+ if (IS_ERR(data))
+ return PTR_ERR(data);
ret = ops->set_tunable(dev, &tuna, data);
-out:
kfree(data);
return ret;
}
@@ -2507,18 +2503,14 @@ static int set_phy_tunable(struct net_device *dev, void __user *useraddr)
ret = ethtool_phy_tunable_valid(&tuna);
if (ret)
return ret;
- data = kmalloc(tuna.len, GFP_USER);
- if (!data)
- return -ENOMEM;
useraddr += sizeof(tuna);
- ret = -EFAULT;
- if (copy_from_user(data, useraddr, tuna.len))
- goto out;
+ data = memdup_user(useraddr, tuna.len);
+ if (IS_ERR(data))
+ return PTR_ERR(data);
mutex_lock(&phydev->lock);
ret = phydev->drv->set_tunable(phydev, &tuna, data);
mutex_unlock(&phydev->lock);
-out:
kfree(data);
return ret;
}
diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c
index ec4fe3d4b5c9..ecc4b4a2413e 100644
--- a/net/ipv4/ip_sockglue.c
+++ b/net/ipv4/ip_sockglue.c
@@ -934,14 +934,9 @@ static int do_ip_setsockopt(struct sock *sk, int level,
err = -ENOBUFS;
break;
}
- msf = kmalloc(optlen, GFP_KERNEL);
- if (!msf) {
- err = -ENOBUFS;
- break;
- }
- err = -EFAULT;
- if (copy_from_user(msf, optval, optlen)) {
- kfree(msf);
+ msf = memdup_user(optval, optlen);
+ if (IS_ERR(msf)) {
+ err = PTR_ERR(msf);
break;
}
/* numsrc >= (1G-4) overflow in 32 bits */
@@ -1090,14 +1085,11 @@ static int do_ip_setsockopt(struct sock *sk, int level,
err = -ENOBUFS;
break;
}
- gsf = kmalloc(optlen, GFP_KERNEL);
- if (!gsf) {
- err = -ENOBUFS;
+ gsf = memdup_user(optval, optlen);
+ if (IS_ERR(gsf)) {
+ err = PTR_ERR(gsf);
break;
}
- err = -EFAULT;
- if (copy_from_user(gsf, optval, optlen))
- goto mc_msf_out;
/* numsrc >= (4G-140)/128 overflow in 32 bits */
if (gsf->gf_numsrc >= 0x1ffffff ||
diff --git a/net/ipv6/ipv6_sockglue.c b/net/ipv6/ipv6_sockglue.c
index 85404e7c3114..02d795fe3d7f 100644
--- a/net/ipv6/ipv6_sockglue.c
+++ b/net/ipv6/ipv6_sockglue.c
@@ -735,14 +735,9 @@ done:
retv = -ENOBUFS;
break;
}
- gsf = kmalloc(optlen, GFP_KERNEL);
- if (!gsf) {
- retv = -ENOBUFS;
- break;
- }
- retv = -EFAULT;
- if (copy_from_user(gsf, optval, optlen)) {
- kfree(gsf);
+ gsf = memdup_user(optval, optlen);
+ if (IS_ERR(gsf)) {
+ retv = PTR_ERR(gsf);
break;
}
/* numsrc >= (4G-140)/128 overflow in 32 bits */
diff --git a/net/irda/af_irda.c b/net/irda/af_irda.c
index 8d77ad5cadaf..2e6990f8b80b 100644
--- a/net/irda/af_irda.c
+++ b/net/irda/af_irda.c
@@ -1901,16 +1901,10 @@ static int irda_setsockopt(struct socket *sock, int level, int optname,
goto out;
}
- ias_opt = kmalloc(sizeof(struct irda_ias_set), GFP_ATOMIC);
- if (ias_opt == NULL) {
- err = -ENOMEM;
- goto out;
- }
-
/* Copy query to the driver. */
- if (copy_from_user(ias_opt, optval, optlen)) {
- kfree(ias_opt);
- err = -EFAULT;
+ ias_opt = memdup_user(optval, optlen);
+ if (IS_ERR(ias_opt)) {
+ err = PTR_ERR(ias_opt);
goto out;
}
@@ -2032,16 +2026,10 @@ static int irda_setsockopt(struct socket *sock, int level, int optname,
goto out;
}
- ias_opt = kmalloc(sizeof(struct irda_ias_set), GFP_ATOMIC);
- if (ias_opt == NULL) {
- err = -ENOMEM;
- goto out;
- }
-
/* Copy query to the driver. */
- if (copy_from_user(ias_opt, optval, optlen)) {
- kfree(ias_opt);
- err = -EFAULT;
+ ias_opt = memdup_user(optval, optlen);
+ if (IS_ERR(ias_opt)) {
+ err = PTR_ERR(ias_opt);
goto out;
}
@@ -2317,16 +2305,10 @@ bed:
goto out;
}
- ias_opt = kmalloc(sizeof(struct irda_ias_set), GFP_ATOMIC);
- if (ias_opt == NULL) {
- err = -ENOMEM;
- goto out;
- }
-
/* Copy query to the driver. */
- if (copy_from_user(ias_opt, optval, len)) {
- kfree(ias_opt);
- err = -EFAULT;
+ ias_opt = memdup_user(optval, len);
+ if (IS_ERR(ias_opt)) {
+ err = PTR_ERR(ias_opt);
goto out;
}
@@ -2381,16 +2363,10 @@ bed:
goto out;
}
- ias_opt = kmalloc(sizeof(struct irda_ias_set), GFP_ATOMIC);
- if (ias_opt == NULL) {
- err = -ENOMEM;
- goto out;
- }
-
/* Copy query to the driver. */
- if (copy_from_user(ias_opt, optval, len)) {
- kfree(ias_opt);
- err = -EFAULT;
+ ias_opt = memdup_user(optval, len);
+ if (IS_ERR(ias_opt)) {
+ err = PTR_ERR(ias_opt);
goto out;
}
diff --git a/security/selinux/selinuxfs.c b/security/selinux/selinuxfs.c
index 9010a3632d6f..00eed842c491 100644
--- a/security/selinux/selinuxfs.c
+++ b/security/selinux/selinuxfs.c
@@ -649,14 +649,12 @@ static ssize_t sel_write_validatetrans(struct file *file,
if (*ppos != 0)
goto out;
- rc = -ENOMEM;
- req = kzalloc(count + 1, GFP_KERNEL);
- if (!req)
- goto out;
-
- rc = -EFAULT;
- if (copy_from_user(req, buf, count))
+ req = memdup_user_nul(buf, count);
+ if (IS_ERR(req)) {
+ rc = PTR_ERR(req);
+ req = NULL;
goto out;
+ }
rc = -ENOMEM;
oldcon = kzalloc(count + 1, GFP_KERNEL);