Commit a1b7f2f6 authored by Rasmus Villemoes's avatar Rasmus Villemoes Committed by Bjorn Helgaas

PCI/AER: Avoid info leak in __print_tlp_header()

Commit fab4c256 ("PCI/AER: Add a TLP header print helper") introduced
the helper function __print_tlp_header(), but contrary to the intention,
the behaviour did change: Since we're taking the address of the parameter
t, the first 4 or 8 bytes printed will be the value of the pointer t
itself, and the remaining 12 or 8 bytes will be who-knows-what (something
from the stack).

We want to show the values of the four members of the struct
aer_header_log_regs; that can be done without ugly and error-prone casts.
On little-endian this should produce the same output as originally
intended, and since no-one has complained about getting garbage output so
far, I think big-endian should be ok too.

Fixes: fab4c256 ("PCI/AER: Add a TLP header print helper")
Signed-off-by: default avatarRasmus Villemoes <linux@rasmusvillemoes.dk>
Signed-off-by: default avatarBjorn Helgaas <bhelgaas@google.com>
Acked-by: default avatarBorislav Petkov <bp@suse.de>
CC: stable@vger.kernel.org	# v3.14+
parent a43f32d6
......@@ -132,16 +132,8 @@ static const char *aer_agent_string[] = {
static void __print_tlp_header(struct pci_dev *dev,
struct aer_header_log_regs *t)
{
unsigned char *tlp = (unsigned char *)&t;
dev_err(&dev->dev, " TLP Header:"
" %02x%02x%02x%02x %02x%02x%02x%02x"
" %02x%02x%02x%02x %02x%02x%02x%02x\n",
*(tlp + 3), *(tlp + 2), *(tlp + 1), *tlp,
*(tlp + 7), *(tlp + 6), *(tlp + 5), *(tlp + 4),
*(tlp + 11), *(tlp + 10), *(tlp + 9),
*(tlp + 8), *(tlp + 15), *(tlp + 14),
*(tlp + 13), *(tlp + 12));
dev_err(&dev->dev, " TLP Header: %08x %08x %08x %08x\n",
t->dw0, t->dw1, t->dw2, t->dw3);
}
static void __aer_print_error(struct pci_dev *dev,
......
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