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[Qemu-devel] [PATCH] net: limit allocation in nc_sendv_compat
From: |
Peter Lieven |
Subject: |
[Qemu-devel] [PATCH] net: limit allocation in nc_sendv_compat |
Date: |
Thu, 30 Jun 2016 11:49:40 +0200 |
we only need to allocate enough memory to hold the packet. This might be
less than NET_BUFSIZE. Additionally fail early if the packet is larger
than NET_BUFSIZE.
Signed-off-by: Peter Lieven <address@hidden>
---
net/net.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/net/net.c b/net/net.c
index 5f3e5a9..54a578d 100644
--- a/net/net.c
+++ b/net/net.c
@@ -690,9 +690,13 @@ static ssize_t nc_sendv_compat(NetClientState *nc, const
struct iovec *iov,
buffer = iov[0].iov_base;
offset = iov[0].iov_len;
} else {
- buf = g_new(uint8_t, NET_BUFSIZE);
+ offset = iov_size(iov, iovcnt);
+ if (offset > NET_BUFSIZE) {
+ return -1;
+ }
+ buf = g_malloc(offset);
buffer = buf;
- offset = iov_to_buf(iov, iovcnt, 0, buf, NET_BUFSIZE);
+ offset = iov_to_buf(iov, iovcnt, 0, buf, offset);
}
if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) {
--
1.9.1
- [Qemu-devel] [PATCH] net: limit allocation in nc_sendv_compat,
Peter Lieven <=