summaryrefslogtreecommitdiff
path: root/drivers/pci/pci-label.c
diff options
context:
space:
mode:
authorKrzysztof Wilczyński <kw@linux.com>2021-06-03 00:01:12 +0000
committerBjorn Helgaas <bhelgaas@google.com>2021-06-03 16:45:42 -0500
commitbdcdaa13ad96f1a530711c29e6d4b8311eff767c (patch)
treebdf6692dd43497f8710e3ec360564ef9a1f70098 /drivers/pci/pci-label.c
parent6efb943b8616ec53a5e444193dccf1af9ad627b5 (diff)
PCI/sysfs: Fix dsm_label_utf16s_to_utf8s() buffer overrun
"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: 6058989bad05 ("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>
Diffstat (limited to 'drivers/pci/pci-label.c')
-rw-r--r--drivers/pci/pci-label.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/pci/pci-label.c b/drivers/pci/pci-label.c
index c32f3b7540e8..76b381cf70b2 100644
--- a/drivers/pci/pci-label.c
+++ b/drivers/pci/pci-label.c
@@ -145,7 +145,7 @@ static void dsm_label_utf16s_to_utf8s(union acpi_object *obj, char *buf)
len = utf16s_to_utf8s((const wchar_t *)obj->buffer.pointer,
obj->buffer.length,
UTF16_LITTLE_ENDIAN,
- buf, PAGE_SIZE);
+ buf, PAGE_SIZE - 1);
buf[len] = '\n';
}