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PCI/sysfs: Fix dsm_label_utf16s_to_utf8s() buffer overrun
[ Upstream commitbdcdaa13ad
] "utf16s_to_utf8s(..., buf, PAGE_SIZE)" puts up to PAGE_SIZE bytes into "buf" and returns the number of bytes it actually put there. If it wrote PAGE_SIZE bytes, the newline added by dsm_label_utf16s_to_utf8s() would overrun "buf". Reduce the size available for utf16s_to_utf8s() to use so there is always space for the newline. [bhelgaas: reorder patch in series, commit log] Fixes:6058989bad
("PCI: Export ACPI _DSM provided firmware instance number and string name to sysfs") Link: https://lore.kernel.org/r/20210603000112.703037-7-kw@linux.com Reported-by: Joe Perches <joe@perches.com> Signed-off-by: Krzysztof Wilczyński <kw@linux.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
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@ -161,7 +161,7 @@ static void dsm_label_utf16s_to_utf8s(union acpi_object *obj, char *buf)
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len = utf16s_to_utf8s((const wchar_t *)obj->buffer.pointer,
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obj->buffer.length,
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UTF16_LITTLE_ENDIAN,
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buf, PAGE_SIZE);
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buf, PAGE_SIZE - 1);
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buf[len] = '\n';
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}
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