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dmaengine: sun6i: Fix memory leaks 

The sun6i_dma_prep_memcpy and sun6i_dma_prep_slave_sg functions were both
leaking the descriptor they allocated if an  error was happening after a
successful dma_pool_alloc call.

It also fixes a memleak that was happening in the scatter gather list
traversal, that was allocating as much descriptor as there was scatter gather
items, but only freeing the current descriptor if an error was to arise.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Maxime Ripard 2014-07-30 10:30:23 +02:00 committed by Vinod Koul
parent 174427c1bb
commit 4fbd804e00
1 changed files with 12 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
drivers/dma/sun6i-dma.c
View File

@ -562,8 +562,7 @@ static struct dma_async_tx_descriptor *sun6i_dma_prep_dma_memcpy(
v_lli = dma_pool_alloc(sdev->pool, GFP_NOWAIT, &p_lli);
if (!v_lli) {
dev_err(sdev->slave.dev, "Failed to alloc lli memory\n");
kfree(txd);
return NULL;
goto err_txd_free;
}
ret = sun6i_dma_cfg_lli(v_lli, src, dest, len, sconfig);
@ -583,6 +582,8 @@ static struct dma_async_tx_descriptor *sun6i_dma_prep_dma_memcpy(
err_dma_free:
dma_pool_free(sdev->pool, v_lli, p_lli);
err_txd_free:
kfree(txd);
return NULL;
}
@ -614,17 +615,15 @@ static struct dma_async_tx_descriptor *sun6i_dma_prep_slave_sg(
for_each_sg(sgl, sg, sg_len, i) {
v_lli = dma_pool_alloc(sdev->pool, GFP_NOWAIT, &p_lli);
if (!v_lli) {
kfree(txd);
return NULL;
}
if (!v_lli)
goto err_lli_free;
if (dir == DMA_MEM_TO_DEV) {
ret = sun6i_dma_cfg_lli(v_lli, sg_dma_address(sg),
sconfig->dst_addr, sg_dma_len(sg),
sconfig);
if (ret)
goto err_dma_free;
goto err_cur_lli_free;
v_lli->cfg |= DMA_CHAN_CFG_DST_IO_MODE |
DMA_CHAN_CFG_SRC_LINEAR_MODE |
@ -642,7 +641,7 @@ static struct dma_async_tx_descriptor *sun6i_dma_prep_slave_sg(
sg_dma_address(sg), sg_dma_len(sg),
sconfig);
if (ret)
goto err_dma_free;
goto err_cur_lli_free;
v_lli->cfg |= DMA_CHAN_CFG_DST_LINEAR_MODE |
DMA_CHAN_CFG_SRC_IO_MODE |
@ -665,8 +664,12 @@ static struct dma_async_tx_descriptor *sun6i_dma_prep_slave_sg(
return vchan_tx_prep(&vchan->vc, &txd->vd, flags);
err_dma_free:
err_cur_lli_free:
dma_pool_free(sdev->pool, v_lli, p_lli);
err_lli_free:
for (prev = txd->v_lli; prev; prev = prev->v_lli_next)
dma_pool_free(sdev->pool, prev, virt_to_phys(prev));
kfree(txd);
return NULL;
}