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| author | Peter Hurley <peter@hurleysoftware.com> | 2013-03-08 12:43:27 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-03-08 15:05:33 -0800 |
| commit | 88b9e456b1649722673ffa147914299799dc9041 (patch) | |
| tree | cb2c12ee6fc4ad53e1a15c4e19f676b1d0058183 /ipc/msg.c | |
| parent | e1082f45f1e2bbf6e25f6b614fc6616ebf709d19 (diff) | |
| download | lwn-88b9e456b1649722673ffa147914299799dc9041.tar.gz lwn-88b9e456b1649722673ffa147914299799dc9041.zip | |
ipc: don't allocate a copy larger than max
When MSG_COPY is set, a duplicate message must be allocated for the copy
before locking the queue. However, the copy could not be larger than was
sent which is limited to msg_ctlmax.
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Acked-by: Stanislav Kinsbursky <skinsbursky@parallels.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'ipc/msg.c')
| -rw-r--r-- | ipc/msg.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/ipc/msg.c b/ipc/msg.c index 950572f9d796..31cd1bf6af27 100644 --- a/ipc/msg.c +++ b/ipc/msg.c @@ -820,15 +820,17 @@ long do_msgrcv(int msqid, void __user *buf, size_t bufsz, long msgtyp, struct msg_msg *copy = NULL; unsigned long copy_number = 0; + ns = current->nsproxy->ipc_ns; + if (msqid < 0 || (long) bufsz < 0) return -EINVAL; if (msgflg & MSG_COPY) { - copy = prepare_copy(buf, bufsz, msgflg, &msgtyp, ©_number); + copy = prepare_copy(buf, min_t(size_t, bufsz, ns->msg_ctlmax), + msgflg, &msgtyp, ©_number); if (IS_ERR(copy)) return PTR_ERR(copy); } mode = convert_mode(&msgtyp, msgflg); - ns = current->nsproxy->ipc_ns; msq = msg_lock_check(ns, msqid); if (IS_ERR(msq)) { |