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authorPeter Hurley <peter@hurleysoftware.com>2013-04-30 19:14:25 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2013-05-01 08:12:57 -0700
commit3d8fa456d5ed22ce8db085a89a037b87568b2b64 (patch)
tree3e8351d43bea10a10a553f10d1029dcb240a1c39
parent08d76760832993050ad8c25e63b56773ef2ca303 (diff)
downloadlinux-3d8fa456d5ed22ce8db085a89a037b87568b2b64.tar.gz
ipc: clamp with min()
Signed-off-by: Peter Hurley <peter@hurleysoftware.com> Acked-by: Stanislav Kinsbursky <skinsbursky@parallels.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--ipc/msgutil.c30
1 files changed, 8 insertions, 22 deletions
diff --git a/ipc/msgutil.c b/ipc/msgutil.c
index 5df8e4bf1db..98b1c2b476c 100644
--- a/ipc/msgutil.c
+++ b/ipc/msgutil.c
@@ -41,8 +41,8 @@ struct msg_msgseg {
/* the next part of the message follows immediately */
};
-#define DATALEN_MSG (PAGE_SIZE-sizeof(struct msg_msg))
-#define DATALEN_SEG (PAGE_SIZE-sizeof(struct msg_msgseg))
+#define DATALEN_MSG (int)(PAGE_SIZE-sizeof(struct msg_msg))
+#define DATALEN_SEG (int)(PAGE_SIZE-sizeof(struct msg_msgseg))
struct msg_msg *load_msg(const void __user *src, int len)
{
@@ -51,10 +51,7 @@ struct msg_msg *load_msg(const void __user *src, int len)
int err;
int alen;
- alen = len;
- if (alen > DATALEN_MSG)
- alen = DATALEN_MSG;
-
+ alen = min(len, DATALEN_MSG);
msg = kmalloc(sizeof(*msg) + alen, GFP_KERNEL);
if (msg == NULL)
return ERR_PTR(-ENOMEM);
@@ -72,9 +69,7 @@ struct msg_msg *load_msg(const void __user *src, int len)
pseg = &msg->next;
while (len > 0) {
struct msg_msgseg *seg;
- alen = len;
- if (alen > DATALEN_SEG)
- alen = DATALEN_SEG;
+ alen = min(len, DATALEN_SEG);
seg = kmalloc(sizeof(*seg) + alen,
GFP_KERNEL);
if (seg == NULL) {
@@ -113,19 +108,14 @@ struct msg_msg *copy_msg(struct msg_msg *src, struct msg_msg *dst)
if (src->m_ts > dst->m_ts)
return ERR_PTR(-EINVAL);
- alen = len;
- if (alen > DATALEN_MSG)
- alen = DATALEN_MSG;
-
+ alen = min(len, DATALEN_MSG);
memcpy(dst + 1, src + 1, alen);
len -= alen;
dst_pseg = dst->next;
src_pseg = src->next;
while (len > 0) {
- alen = len;
- if (alen > DATALEN_SEG)
- alen = DATALEN_SEG;
+ alen = min(len, DATALEN_SEG);
memcpy(dst_pseg + 1, src_pseg + 1, alen);
dst_pseg = dst_pseg->next;
len -= alen;
@@ -148,9 +138,7 @@ int store_msg(void __user *dest, struct msg_msg *msg, int len)
int alen;
struct msg_msgseg *seg;
- alen = len;
- if (alen > DATALEN_MSG)
- alen = DATALEN_MSG;
+ alen = min(len, DATALEN_MSG);
if (copy_to_user(dest, msg + 1, alen))
return -1;
@@ -158,9 +146,7 @@ int store_msg(void __user *dest, struct msg_msg *msg, int len)
dest = ((char __user *)dest) + alen;
seg = msg->next;
while (len > 0) {
- alen = len;
- if (alen > DATALEN_SEG)
- alen = DATALEN_SEG;
+ alen = min(len, DATALEN_SEG);
if (copy_to_user(dest, seg + 1, alen))
return -1;
len -= alen;