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firmware: meson_sm: fix to avoid potential NULL pointer dereference

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commit f2ed165619c16577c02b703a114a1f6b52026df4 upstream.

of_match_device() may fail and returns a NULL pointer.

Fix this by checking the return value of of_match_device.

Fixes: 8cde3c2153e8 ("firmware: meson_sm: Rework driver as a proper platform driver")
Signed-off-by: Zhang Shurong <[email protected]>
Reviewed-by: Neil Armstrong <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Neil Armstrong <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Zhang Shurong 2023-07-15 22:13:38 +08:00 • committed by Greg Kroah-Hartman
commit fba9c24c19
1 changed files with 2 additions and 0 deletions
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2
drivers/firmware/meson/meson_sm.c
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@ -302,6 +302,8 @@ static int __init meson_sm_probe(struct platform_device *pdev)
return -ENOMEM;
chip = of_match_device(meson_sm_ids, dev)->data;
if (!chip)
return -EINVAL;
if (chip->cmd_shmem_in_base) {
fw->sm_shmem_in_base = meson_sm_map_shmem(chip->cmd_shmem_in_base,