dsp: add change to fix use-after-free issue
Add change to properly handle the pointers by setting them to NULL after free and adding some null checks before dereferencing. Change-Id: I3e52b9a6885a8d8a91c09f75fe92ba69e3eb555f Signed-off-by: Saurav Kumar <sauravk@codeaurora.org>
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c896ed2237
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9ec95bb9c8
@ -69,7 +69,7 @@ static int msm_audio_dma_buf_map(struct dma_buf *dma_buf,
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bool cma_mem)
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{
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struct msm_audio_alloc_data *alloc_data;
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struct msm_audio_alloc_data *alloc_data = NULL;
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struct device *cb_dev;
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unsigned long ionflag = 0;
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int rc = 0;
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@ -138,6 +138,7 @@ detach_dma_buf:
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alloc_data->attach);
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free_alloc_data:
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kfree(alloc_data);
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alloc_data = NULL;
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return rc;
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}
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@ -179,6 +180,7 @@ static int msm_audio_dma_buf_unmap(struct dma_buf *dma_buf, bool cma_mem)
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list_del(&(alloc_data->list));
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kfree(alloc_data);
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alloc_data = NULL;
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break;
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}
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}
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@ -321,6 +323,11 @@ static int msm_audio_ion_map_buf(struct dma_buf *dma_buf, dma_addr_t *paddr,
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{
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int rc = 0;
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if (!dma_buf || !paddr || !vaddr || !plen) {
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pr_err("%s: Invalid params\n", __func__);
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return -EINVAL;
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}
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rc = msm_audio_ion_get_phys(dma_buf, paddr, plen);
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if (rc) {
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pr_err("%s: ION Get Physical for AUDIO failed, rc = %d\n",
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@ -8487,6 +8487,7 @@ static int q6asm_memory_map_regions(struct audio_client *ac, int dir,
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if (mmap_region_cmd == NULL) {
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rc = -EINVAL;
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kfree(buffer_node);
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buffer_node = NULL;
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return rc;
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}
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mmap_regions = (struct avs_cmd_shared_mem_map_regions *)
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@ -8523,6 +8524,7 @@ static int q6asm_memory_map_regions(struct audio_client *ac, int dir,
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mmap_regions->hdr.opcode, rc);
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rc = -EINVAL;
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kfree(buffer_node);
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buffer_node = NULL;
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goto fail_cmd;
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}
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@ -8534,6 +8536,7 @@ static int q6asm_memory_map_regions(struct audio_client *ac, int dir,
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pr_err("%s: timeout. waited for memory_map\n", __func__);
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rc = -ETIMEDOUT;
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kfree(buffer_node);
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buffer_node = NULL;
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goto fail_cmd;
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}
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if (atomic_read(&ac->mem_state) > 0) {
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@ -8543,6 +8546,7 @@ static int q6asm_memory_map_regions(struct audio_client *ac, int dir,
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rc = adsp_err_get_lnx_err_code(
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atomic_read(&ac->mem_state));
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kfree(buffer_node);
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buffer_node = NULL;
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goto fail_cmd;
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}
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mutex_lock(&ac->cmd_lock);
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@ -8562,6 +8566,7 @@ static int q6asm_memory_map_regions(struct audio_client *ac, int dir,
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rc = 0;
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fail_cmd:
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kfree(mmap_region_cmd);
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mmap_region_cmd = NULL;
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return rc;
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}
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EXPORT_SYMBOL(q6asm_memory_map_regions);
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@ -8657,6 +8662,7 @@ fail_cmd:
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if (buf_node->buf_phys_addr == buf_add) {
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list_del(&buf_node->list);
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kfree(buf_node);
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buf_node = NULL;
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break;
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}
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}
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