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authorWenwen Wang <wang6495@umn.edu>2018-10-10 18:38:28 -0500
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-10-15 20:47:40 +0200
commit6b995f4eec34745f6cb20d66d5277611f0b3c3fa (patch)
tree0ed50ce07a6d997543653f4207c69288252c2762 /drivers
parent6d7d725b2e62b00f6b0b36639ba597efe9cc8ea9 (diff)
misc: mic: fix a DMA pool free failure
In _scif_prog_signal(), the boolean variable 'x100' is used to indicate whether the MIC Coprocessor is X100. If 'x100' is true, the status descriptor will be used to write the value to the destination. Otherwise, a DMA pool will be allocated for this purpose. Specifically, if the DMA pool is allocated successfully, two memory addresses will be returned. One is for the CPU and the other is for the device to access the DMA pool. The former is stored to the variable 'status' and the latter is stored to the variable 'src'. After the allocation, the address in 'src' is saved to 'status->src_dma_addr', which is actually in the DMA pool, and 'src' is then modified. Later on, if an error occurs, the execution flow will transfer to the label 'dma_fail', which will check 'x100' and free up the allocated DMA pool if 'x100' is false. The point here is that 'status->src_dma_addr' is used for freeing up the DMA pool. As mentioned before, 'status->src_dma_addr' is in the DMA pool. And thus, the device is able to modify this data. This can potentially cause failures when freeing up the DMA pool because of the modified device address. This patch avoids the above issue by using the variable 'src' (with necessary calculation) to free up the DMA pool. Signed-off-by: Wenwen Wang <wang6495@umn.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/misc/mic/scif/scif_fence.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/misc/mic/scif/scif_fence.c b/drivers/misc/mic/scif/scif_fence.c
index cac3bcc308a7..7bb929f05d85 100644
--- a/drivers/misc/mic/scif/scif_fence.c
+++ b/drivers/misc/mic/scif/scif_fence.c
@@ -272,7 +272,7 @@ static int _scif_prog_signal(scif_epd_t epd, dma_addr_t dst, u64 val)
dma_fail:
if (!x100)
dma_pool_free(ep->remote_dev->signal_pool, status,
- status->src_dma_addr);
+ src - offsetof(struct scif_status, val));
alloc_fail:
return err;
}