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[Qemu-devel] [PATCH] Fix parse of usb device description with multiple c
From: |
Cao,Bing Bu |
Subject: |
[Qemu-devel] [PATCH] Fix parse of usb device description with multiple configurations |
Date: |
Thu, 8 Dec 2011 14:36:15 +0800 |
When testing ipod on QEMU by He Jie Xu<address@hidden>,qemu made a assertion.
We found that the ipod with 2 configurations,and the usb-linux did not parse
the descriptor correctly.
The descr_len returned is the total length of the all configurations,not one
configuration.
The older version will through the other configurations instead of
skip,continue parsing the descriptor of interfaces/endpoints in other
configurations,then went wrong.
This patch will put the configuration descriptor parse in loop outside and
dispel the other configurations not requested.
Signed-off-by: Cao,Bing Bu <address@hidden>
---
usb-linux.c | 20 ++++++++++++--------
1 files changed, 12 insertions(+), 8 deletions(-)
diff --git a/usb-linux.c b/usb-linux.c
index ab4c693..a53b558 100644
--- a/usb-linux.c
+++ b/usb-linux.c
@@ -1141,15 +1141,19 @@ static int usb_linux_update_endp_table(USBHostDevice *s)
length = s->descr_len - 18;
i = 0;
- if (descriptors[i + 1] != USB_DT_CONFIG ||
- descriptors[i + 5] != s->configuration) {
- fprintf(stderr, "invalid descriptor data - configuration %d\n",
- s->configuration);
- return 1;
- }
- i += descriptors[i];
-
while (i < length) {
+ if (descriptors[i + 1] != USB_DT_CONFIG) {
+ fprintf(stderr, "invalid descriptor data\n");
+ return 1;
+ } else if (descriptors[i + 5] != s->configuration) {
+ fprintf(stderr, "not requested configuration %d\n",
+ s->configuration);
+ i += (descriptors[i + 3] << 8) + descriptors[i + 2];
+ continue;
+ }
+
+ i += descriptors[i];
+
if (descriptors[i + 1] != USB_DT_INTERFACE ||
(descriptors[i + 1] == USB_DT_INTERFACE &&
descriptors[i + 4] == 0)) {
--
1.7.1
- [Qemu-devel] [PATCH] Fix parse of usb device description with multiple configurations,
Cao,Bing Bu <=