6.15-stable review patch. If anyone has any objections, please let me know.
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From: Cezary Rojewski cezary.rojewski@intel.com
[ Upstream commit 93e246b6769bdacb09cfff4ea0f00fe5ab4f0d7a ]
The first element of the returned array stores its length. If it is 0, any manipulation beyond the element at index 0 ends with null-ptr-deref.
Fixes: 5a565ba23abe ("ASoC: Intel: avs: Probing and firmware tracing over debugfs") Reviewed-by: Amadeusz Sławiński amadeuszx.slawinski@linux.intel.com Signed-off-by: Cezary Rojewski cezary.rojewski@intel.com Link: https://patch.msgid.link/20250530141025.2942936-8-cezary.rojewski@intel.com Signed-off-by: Mark Brown broonie@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- sound/soc/intel/avs/debugfs.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/sound/soc/intel/avs/debugfs.c b/sound/soc/intel/avs/debugfs.c index 8c4edda97f757..0e826ca20619c 100644 --- a/sound/soc/intel/avs/debugfs.c +++ b/sound/soc/intel/avs/debugfs.c @@ -373,7 +373,10 @@ static ssize_t trace_control_write(struct file *file, const char __user *from, s return ret;
num_elems = *array; - resource_mask = array[1]; + if (!num_elems) { + ret = -EINVAL; + goto free_array; + }
/* * Disable if just resource mask is provided - no log priority flags. @@ -381,6 +384,7 @@ static ssize_t trace_control_write(struct file *file, const char __user *from, s * Enable input format: mask, prio1, .., prioN * Where 'N' equals number of bits set in the 'mask'. */ + resource_mask = array[1]; if (num_elems == 1) { ret = disable_logs(adev, resource_mask); } else {