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media: atomisp: gmin_platform: fix out_len in gmin_get_config_dsm_var()

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[ Upstream commit 1657f2934daf89e8d9fa4b2697008909eb22c73e ]

Ideally, strlen(cur->string.pointer) and strlen(out) would be the same.
But this code is using strscpy() to avoid a potential buffer overflow.
So in the same way we should take the strlen() of the smaller string to
avoid a buffer overflow in the caller, gmin_get_var_int().

Link: https://lore.kernel.org/r/26124bcd-8132-4483-9d67-225c87d424e8@kili.mountain

Fixes: 387041cda4 ("media: atomisp: improve sensor detection code to use _DSM table")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Dan Carpenter 2023-05-26 12:53:23 +01:00 committed by Greg Kroah-Hartman
parent b754ea60e6
commit 4e8e838fce
1 changed files with 1 additions and 1 deletions
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2
drivers/staging/media/atomisp/pci/atomisp_gmin_platform.c
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@ -1198,7 +1198,7 @@ static int gmin_get_config_dsm_var(struct device *dev,
dev_info(dev, "found _DSM entry for '%s': %s\n", var,
cur->string.pointer);
strscpy(out, cur->string.pointer, *out_len);
*out_len = strlen(cur->string.pointer);
*out_len = strlen(out);
ACPI_FREE(obj);
return 0;