diff options
author | Peter Hurley <peter@hurleysoftware.com> | 2013-05-01 04:14:31 +0200 |
---|---|---|
committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-05-01 17:12:57 +0200 |
commit | be5f4b335f6e05df1b5c24b7e7d79ff52d7b8dbc (patch) | |
tree | 5076680c91f139ba8908d7ecd51dd02206e57496 /ipc/msgutil.c | |
parent | ipc: clamp with min() (diff) | |
download | linux-be5f4b335f6e05df1b5c24b7e7d79ff52d7b8dbc.tar.xz linux-be5f4b335f6e05df1b5c24b7e7d79ff52d7b8dbc.zip |
ipc: separate msg allocation from userspace copy
Separating msg allocation enables single-block vmalloc
allocation instead.
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>
Diffstat (limited to 'ipc/msgutil.c')
-rw-r--r-- | ipc/msgutil.c | 52 |
1 files changed, 38 insertions, 14 deletions
diff --git a/ipc/msgutil.c b/ipc/msgutil.c index 98b1c2b476cc..0a5c8a95c257 100644 --- a/ipc/msgutil.c +++ b/ipc/msgutil.c @@ -44,21 +44,54 @@ 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) + +static struct msg_msg *alloc_msg(int len) { struct msg_msg *msg; struct msg_msgseg **pseg; - int err; int alen; alen = min(len, DATALEN_MSG); msg = kmalloc(sizeof(*msg) + alen, GFP_KERNEL); if (msg == NULL) - return ERR_PTR(-ENOMEM); + return NULL; msg->next = NULL; msg->security = NULL; + len -= alen; + pseg = &msg->next; + while (len > 0) { + struct msg_msgseg *seg; + alen = min(len, DATALEN_SEG); + seg = kmalloc(sizeof(*seg) + alen, GFP_KERNEL); + if (seg == NULL) + goto out_err; + *pseg = seg; + seg->next = NULL; + pseg = &seg->next; + len -= alen; + } + + return msg; + +out_err: + free_msg(msg); + return NULL; +} + +struct msg_msg *load_msg(const void __user *src, int len) +{ + struct msg_msg *msg; + struct msg_msgseg *seg; + int err; + int alen; + + msg = alloc_msg(len); + if (msg == NULL) + return ERR_PTR(-ENOMEM); + + alen = min(len, DATALEN_MSG); if (copy_from_user(msg + 1, src, alen)) { err = -EFAULT; goto out_err; @@ -66,23 +99,14 @@ struct msg_msg *load_msg(const void __user *src, int len) len -= alen; src = ((char __user *)src) + alen; - pseg = &msg->next; + seg = msg->next; while (len > 0) { - struct msg_msgseg *seg; alen = min(len, DATALEN_SEG); - seg = kmalloc(sizeof(*seg) + alen, - GFP_KERNEL); - if (seg == NULL) { - err = -ENOMEM; - goto out_err; - } - *pseg = seg; - seg->next = NULL; if (copy_from_user(seg + 1, src, alen)) { err = -EFAULT; goto out_err; } - pseg = &seg->next; + seg = seg->next; len -= alen; src = ((char __user *)src) + alen; } |