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authorAndrey Ryabinin <a.ryabinin@samsung.com>2015-01-27 16:00:19 +0300
committerEric Van Hensbergen <ericvh@gmail.com>2015-03-20 17:34:43 +0300
commit179a5bc4b8cbe68ca675057b960dd805867e41c4 (patch)
tree600cff80e3c7483509d90ef2a4dad7db529a5ec3 /net
parent6250a8badb311953a49bedb16ed17eb59d21c03a (diff)
downloadlinux-179a5bc4b8cbe68ca675057b960dd805867e41c4.tar.xz
net/9p: use memcpy() instead of snprintf() in p9_mount_tag_show()
p9_mount_tag_show() uses '%s' format string to print non-NULL terminated chan->tag string. This leads to out of bounds memory read, because format '%s' implies that string is NULL-terminated. The length of string is know here, so its simpler and safer to use memcpy instead of snprintf(). Signed-off-by: Andrey Ryabinin <a.ryabinin@samsung.com> Signed-off-by: Dominique Martinet <dominique.martinet@cea.fr> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
Diffstat (limited to 'net')
-rw-r--r--net/9p/trans_virtio.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/net/9p/trans_virtio.c b/net/9p/trans_virtio.c
index 36a1a739ad68..486df019f875 100644
--- a/net/9p/trans_virtio.c
+++ b/net/9p/trans_virtio.c
@@ -504,7 +504,10 @@ static ssize_t p9_mount_tag_show(struct device *dev,
vdev = dev_to_virtio(dev);
chan = vdev->priv;
- return snprintf(buf, chan->tag_len + 1, "%s", chan->tag);
+ memcpy(buf, chan->tag, chan->tag_len);
+ buf[chan->tag_len] = 0;
+
+ return chan->tag_len + 1;
}
static DEVICE_ATTR(mount_tag, 0444, p9_mount_tag_show, NULL);