[PATCH 4.4 12/25] async_pq_val: fix DMA memory leak

From: Greg Kroah-Hartman
Date: Fri Oct 21 2016 - 05:16:36 EST


4.4-stable review patch. If anyone has any objections, please let me know.

------------------

From: Justin Maggard <jmaggard10@xxxxxxxxx>

commit c84750906b4818d4929fbf73a4ae6c113b94f52b upstream.

Add missing dmaengine_unmap_put(), so we don't OOM during RAID6 sync.

Fixes: 1786b943dad0 ("async_pq_val: convert to dmaengine_unmap_data")
Signed-off-by: Justin Maggard <jmaggard@xxxxxxxxxxx>
Reviewed-by: Dan Williams <dan.j.williams@xxxxxxxxx>
Signed-off-by: Vinod Koul <vinod.koul@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
crypto/async_tx/async_pq.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)

--- a/crypto/async_tx/async_pq.c
+++ b/crypto/async_tx/async_pq.c
@@ -368,8 +368,6 @@ async_syndrome_val(struct page **blocks,

dma_set_unmap(tx, unmap);
async_tx_submit(chan, tx, submit);
-
- return tx;
} else {
struct page *p_src = P(blocks, disks);
struct page *q_src = Q(blocks, disks);
@@ -424,9 +422,11 @@ async_syndrome_val(struct page **blocks,
submit->cb_param = cb_param_orig;
submit->flags = flags_orig;
async_tx_sync_epilog(submit);
-
- return NULL;
+ tx = NULL;
}
+ dmaengine_unmap_put(unmap);
+
+ return tx;
}
EXPORT_SYMBOL_GPL(async_syndrome_val);