Re: [PATCH] ASoC: SOF: Fix null pointer dereference in sof_pci_probe
It's my bad, i'll follow your suggestion in v2 patch: 1. remove 'Fixes: 46207ca24545' label
2. rename subject to 'ASoC: SOF: Add null pointer check to sof_pci_probe'
3. when sof_pdata->fw_filename_prefix is NULL,don't use it to dev_dbg. Or just use a if (sof_pdata->fw_filename_prefix) dev_dbg(dev, "Platform uses community key, changed fw path to %s\n", sof_pdata->fw_filename_prefix); else dev_dbg(dev, "Platform uses community key, changed fw path to %s/%s\n", sof_pdata->desc->default_fw_path[sof_pdata->ipc_type], "community");
Is it okay to modify it like this?
Thanks, Kunwu
On 2023/12/4 19:34, Péter Ujfalusi wrote:
On 23/11/2023 17:54, Kunwu Chan wrote:
devm_kasprintf() returns a pointer to dynamically allocated memory which can be NULL upon failure.
Fixes: 46207ca24545 ("ASoC: SOF: pci: change the default firmware path when the community key is used") Fixes: 25bbc0c59ee1 ("ASoC: SOF: Add path definition for external firmware libraries") Signed-off-by: Kunwu Chan chentao@kylinos.cn
This patch cannot fix both commits as at 46207ca24545 the lib path was not present. Please don't bundle unrelated fixes, it makes maintainers life harder.
As a note: if the allocation fails it is not going to cause null dereference as the code checks !sof_pdata->*_prefix to see if it is provided (override) or not (use default). At most it will cause the kernel to 'ignore' the path override, but if this allocation fails this is least of our problem ;)
sound/soc/sof/sof-pci-dev.c | 8 ++++++++ 1 file changed, 8 insertions(+)
diff --git a/sound/soc/sof/sof-pci-dev.c b/sound/soc/sof/sof-pci-dev.c index 64b326e3ef85..75a9bfa5bfbe 100644 --- a/sound/soc/sof/sof-pci-dev.c +++ b/sound/soc/sof/sof-pci-dev.c @@ -282,6 +282,10 @@ int sof_pci_probe(struct pci_dev *pci, const struct pci_device_id *pci_id) devm_kasprintf(dev, GFP_KERNEL, "%s/%s", sof_pdata->desc->default_fw_path[sof_pdata->ipc_type], "community");
if (!sof_pdata->fw_filename_prefix) {ret = -ENOMEM;goto out;}dev_dbg(dev, "Platform uses community key, changed fw path to %s\n",
@@ -303,6 +307,10 @@ int sof_pci_probe(struct pci_dev *pci, const struct pci_device_id *pci_id) devm_kasprintf(dev, GFP_KERNEL, "%s/%s", sof_pdata->desc->default_lib_path[sof_pdata->ipc_type], "community");
if (!sof_pdata->fw_lib_prefix) {ret = -ENOMEM;goto out;} dev_dbg(dev, "Platform uses community key, changed fw_lib path to %s\n",
On 05/12/2023 11:10, Kunwu Chan wrote:
It's my bad, i'll follow your suggestion in v2 patch:
remove 'Fixes: 46207ca24545' label
rename subject to 'ASoC: SOF: Add null pointer check to sof_pci_probe'
when sof_pdata->fw_filename_prefix is NULL,don't use it to dev_dbg.
Or just use a if (sof_pdata->fw_filename_prefix) dev_dbg(dev, "Platform uses community key, changed fw path to %s\n", sof_pdata->fw_filename_prefix); else dev_dbg(dev, "Platform uses community key, changed fw path to %s/%s\n", sof_pdata->desc->default_fw_path[sof_pdata->ipc_type], "community");
Is it okay to modify it like this?
The code has been rewritten and all of these issues have been eliminated, fixed in core SOF.
Thanks, Kunwu
On 2023/12/4 19:34, Péter Ujfalusi wrote:
On 23/11/2023 17:54, Kunwu Chan wrote:
devm_kasprintf() returns a pointer to dynamically allocated memory which can be NULL upon failure.
Fixes: 46207ca24545 ("ASoC: SOF: pci: change the default firmware path when the community key is used") Fixes: 25bbc0c59ee1 ("ASoC: SOF: Add path definition for external firmware libraries") Signed-off-by: Kunwu Chan chentao@kylinos.cn
This patch cannot fix both commits as at 46207ca24545 the lib path was not present. Please don't bundle unrelated fixes, it makes maintainers life harder.
As a note: if the allocation fails it is not going to cause null dereference as the code checks !sof_pdata->*_prefix to see if it is provided (override) or not (use default). At most it will cause the kernel to 'ignore' the path override, but if this allocation fails this is least of our problem ;)
sound/soc/sof/sof-pci-dev.c | 8 ++++++++ 1 file changed, 8 insertions(+)
diff --git a/sound/soc/sof/sof-pci-dev.c b/sound/soc/sof/sof-pci-dev.c index 64b326e3ef85..75a9bfa5bfbe 100644 --- a/sound/soc/sof/sof-pci-dev.c +++ b/sound/soc/sof/sof-pci-dev.c @@ -282,6 +282,10 @@ int sof_pci_probe(struct pci_dev *pci, const struct pci_device_id *pci_id) devm_kasprintf(dev, GFP_KERNEL, "%s/%s", sof_pdata->desc->default_fw_path[sof_pdata->ipc_type], "community"); + if (!sof_pdata->fw_filename_prefix) { + ret = -ENOMEM; + goto out; + } dev_dbg(dev, "Platform uses community key, changed fw path to %s\n", @@ -303,6 +307,10 @@ int sof_pci_probe(struct pci_dev *pci, const struct pci_device_id *pci_id) devm_kasprintf(dev, GFP_KERNEL, "%s/%s", sof_pdata->desc->default_lib_path[sof_pdata->ipc_type], "community"); + if (!sof_pdata->fw_lib_prefix) { + ret = -ENOMEM; + goto out; + } dev_dbg(dev, "Platform uses community key, changed fw_lib path to %s\n",
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