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| author | Krzysztof Wilczyński <kw@linux.com> | 2021-06-03 02:01:12 +0200 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2021-06-03 23:45:42 +0200 |
| commit | bdcdaa13ad96f1a530711c29e6d4b8311eff767c (patch) | |
| tree | bdf6692dd43497f8710e3ec360564ef9a1f70098 | |
| parent | Linux 5.13-rc1 (diff) | |
| download | linux-bdcdaa13ad96f1a530711c29e6d4b8311eff767c.tar.xz linux-bdcdaa13ad96f1a530711c29e6d4b8311eff767c.zip | |
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>
| -rw-r--r-- | drivers/pci/pci-label.c | 2 |
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'; } |