ASoC: SOF: Intel: hda: Use devm_kstrdup() to avoid memleak.

sof_pdata->tplg_filename can have address allocated by kstrdup()
and can be overwritten. Memory leak was detected with kmemleak:

unreferenced object 0xffff88812391ff60 (size 16):
  comm "kworker/4:1", pid 161, jiffies 4294802931
  hex dump (first 16 bytes):
    73 6f 66 2d 68 64 61 2d 67 65 6e 65 72 69 63 00  sof-hda-generic.
  backtrace (crc 4bf1675c):
    __kmalloc_node_track_caller_noprof+0x49c/0x6b0
    kstrdup+0x46/0xc0
    hda_machine_select.cold+0x1de/0x12cf [snd_sof_intel_hda_generic]
    sof_init_environment+0x16f/0xb50 [snd_sof]
    sof_probe_continue+0x45/0x7c0 [snd_sof]
    sof_probe_work+0x1e/0x40 [snd_sof]
    process_one_work+0x894/0x14b0
    worker_thread+0x5e5/0xfb0
    kthread+0x39d/0x760
    ret_from_fork+0x31/0x70
    ret_from_fork_asm+0x1a/0x30

Signed-off-by: Tamura Dai <kirinode0@gmail.com>
Link: https://patch.msgid.link/20250615235548.8591-1-kirinode0@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/sound/soc/sof/intel/hda.c b/sound/soc/sof/intel/hda.c
index bdfe388da198a2dbf965e3e191956270007085fa..3b47191ea7a5aaf55575cf4c45900ee9e91e4636 100644 (file)
--- a/sound/soc/sof/intel/hda.c
+++ b/sound/soc/sof/intel/hda.c
@@ -1257,11 +1257,11 @@ static int check_tplg_quirk_mask(struct snd_soc_acpi_mach *mach)
        return 0;
 }
 
-static char *remove_file_ext(const char *tplg_filename)
+static char *remove_file_ext(struct device *dev, const char *tplg_filename)
 {
        char *filename, *tmp;
 
-       filename = kstrdup(tplg_filename, GFP_KERNEL);
+       filename = devm_kstrdup(dev, tplg_filename, GFP_KERNEL);
        if (!filename)
                return NULL;
 
@@ -1345,7 +1345,7 @@ struct snd_soc_acpi_mach *hda_machine_select(struct snd_sof_dev *sdev)
                 */
                if (!sof_pdata->tplg_filename) {
                        /* remove file extension if it exists */
-                       tplg_filename = remove_file_ext(mach->sof_tplg_filename);
+                       tplg_filename = remove_file_ext(sdev->dev, mach->sof_tplg_filename);
                        if (!tplg_filename)
                                return NULL;