On Tue, 5 Feb 2008, Matthew Dharm wrote:
> We both agree that the code shouldn't run off the end of the s-g list.
Incidentally, if people want a simple bugfix patch for 2.6.24.stable,
this should do it. Mark, can you confirm that this patch alone fixes
the problem?
Alan Stern
Index: 2.6.24/drivers/usb/storage/protocol.c
===================================================================
--- 2.6.24.orig/drivers/usb/storage/protocol.c
+++ 2.6.24/drivers/usb/storage/protocol.c
@@ -194,7 +194,7 @@ unsigned int usb_stor_access_xfer_buf(un
* and the starting offset within the page, and update
* the *offset and *index values for the next loop. */
cnt = 0;
- while (cnt < buflen) {
+ while (cnt < buflen && sg) {
struct page *page = sg_page(sg) +
((sg->offset + *offset) >> PAGE_SHIFT);
unsigned int poff =
@@ -249,6 +249,7 @@ void usb_stor_set_xfer_buf(unsigned char
unsigned int offset = 0;
struct scatterlist *sg = NULL;
+ buflen = min(buflen, srb->request_bufflen);
usb_stor_access_xfer_buf(buffer, buflen, srb, &sg, &offset,
TO_XFER_BUF);
if (buflen < srb->request_bufflen)
-
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