The patch titled
Subject: ipc: clamp with min()
has been added to the -mm tree. Its filename is
ipc-clamp-with-min.patch
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------------------------------------------------------
From: Peter Hurley <peter@xxxxxxxxxxxxxxxxxx>
Subject: ipc: clamp with min()
Signed-off-by: Peter Hurley <peter@xxxxxxxxxxxxxxxxxx>
Acked-by: Stanislav Kinsbursky <skinsbursky@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
ipc/msgutil.c | 30 ++++++++----------------------
1 file changed, 8 insertions(+), 22 deletions(-)
diff -puN ipc/msgutil.c~ipc-clamp-with-min ipc/msgutil.c
--- a/ipc/msgutil.c~ipc-clamp-with-min
+++ a/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 __us
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 __us
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
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
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
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;
_
Patches currently in -mm which might be from peter@xxxxxxxxxxxxxxxxxx are
origin.patch
ipc-fix-potential-oops-when-src-msg-4k-w-msg_copy.patch
ipc-dont-allocate-a-copy-larger-than-max.patch
ipc-clamp-with-min.patch
ipc-separate-msg-allocation-from-userspace-copy.patch
ipc-tighten-msg-copy-loops.patch
ipc-set-efault-as-default-error-in-load_msg.patch
ipc-remove-msg-handling-from-queue-scan.patch
ipc-implement-msg_copy-as-a-new-receive-mode.patch
ipc-simplify-msg-list-search.patch
ipc-refactor-msg-list-search-into-separate-function.patch
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