-stable review patch. If anyone has any objections, please let us know.
------------------
From: Michael S. Tsirkin <[email protected]>
mthca_table_find() will return the wrong address when the table entry
being searched for is exactly at the beginning of a sglist entry
(other than the first), because it uses >= when it should use >.
Example: assume we have 2 entries in scatterlist, 4K each, offset is
4K. The current code will return first entry + 4K when we really want
the second entry.
In particular this means mapping an FMR on a memfree HCA may end up
writing the page table into the wrong place, leading to memory
corruption and also causing the HCA to use an incorrect address
translation table.
Signed-off-by: Michael S. Tsirkin <[email protected]>
Signed-off-by: Roland Dreier <[email protected]>
Signed-off-by: Chris Wright <[email protected]>
---
This is upstream, and fixes a data corruption/crash bug with storage
over SRP.
drivers/infiniband/hw/mthca/mthca_memfree.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- linux-2.6.19.2.orig/drivers/infiniband/hw/mthca/mthca_memfree.c
+++ linux-2.6.19.2/drivers/infiniband/hw/mthca/mthca_memfree.c
@@ -232,7 +232,7 @@ void *mthca_table_find(struct mthca_icm_
list_for_each_entry(chunk, &icm->chunk_list, list) {
for (i = 0; i < chunk->npages; ++i) {
- if (chunk->mem[i].length >= offset) {
+ if (chunk->mem[i].length > offset) {
page = chunk->mem[i].page;
goto out;
}
--
-
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