| Message ID | 20250222-q6apm-kcalloc-v1-1-6f09dae6c31c@ethancedwards.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | ASoC: q6dsp: q6apm: replace kzalloc() with kcalloc() in q6apm_map_memory_regions() | expand |
… > We are trying to get rid of all multiplications from allocation > functions to prevent integer overflows[1]. … Is an imperative wording more desirable for such a change description? https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/process/submitting-patches.rst?h=v6.14-rc3#n94 … > --- > sound/soc/qcom/qdsp6/q6apm.c | 2 +- … How do you think about to improve your version management? https://lore.kernel.org/all/?q=%22This+looks+like+a+new+version+of+a+previously+submitted+patch%22 https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/process/submitting-patches.rst?h=v6.14-rc3#n780 … > +++ b/sound/soc/qcom/qdsp6/q6apm.c > @@ -230,7 +230,7 @@ int q6apm_map_memory_regions(struct q6apm_graph *graph, unsigned int dir, phys_a > return 0; > } > > - buf = kzalloc(((sizeof(struct audio_buffer)) * periods), GFP_KERNEL); > + buf = kcalloc(periods, sizeof(struct audio_buffer), GFP_KERNEL); … See also: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/process/coding-style.rst?h=v6.14-rc3#n941 How do you think about to increase the application of scope-based resource management? Regards, Markus
diff --git a/sound/soc/qcom/qdsp6/q6apm.c b/sound/soc/qcom/qdsp6/q6apm.c index 2a2a5bd98110bc70c2a164efb22df4147979d295..11e252a70f6972ed8527a0a70a5a3dcf37dfac31 100644 --- a/sound/soc/qcom/qdsp6/q6apm.c +++ b/sound/soc/qcom/qdsp6/q6apm.c @@ -230,7 +230,7 @@ int q6apm_map_memory_regions(struct q6apm_graph *graph, unsigned int dir, phys_a return 0; } - buf = kzalloc(((sizeof(struct audio_buffer)) * periods), GFP_KERNEL); + buf = kcalloc(periods, sizeof(struct audio_buffer), GFP_KERNEL); if (!buf) { mutex_unlock(&graph->lock); return -ENOMEM;
We are trying to get rid of all multiplications from allocation functions to prevent integer overflows[1]. Here the multiplication is obviously safe, but using kcalloc() is more appropriate and improves readability. This patch has no effect on runtime behavior. Link: https://github.com/KSPP/linux/issues/162 [1] Link: https://www.kernel.org/doc/html/next/process/deprecated.html#open-coded-arithmetic-in-allocator-arguments Signed-off-by: Ethan Carter Edwards <ethan@ethancedwards.com> --- sound/soc/qcom/qdsp6/q6apm.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- base-commit: 5cf80612d3f72c46ad53ef5042b4c609c393122f change-id: 20250222-q6apm-kcalloc-5de0fc84c493 Best regards,