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intel_bios_reader: Don't explode looking for the devid

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Check that the offset where expect to find the device id is withing the
BIOS image, instead of accessing whatever (if anything) happens to be
there.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
This commit is contained in:
Ville Syrjälä 2015-03-25 20:23:30 +02:00
parent b1e756451c
commit b701bb14c6
1 changed files with 5 additions and 2 deletions
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7
tools/intel_bios_reader.c
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@ -1055,11 +1055,14 @@ err:
static int
get_device_id(unsigned char *bios)
get_device_id(unsigned char *bios, int size)
{
int device;
int offset = (bios[0x19] << 8) + bios[0x18];
if (offset + 7 >= size)
return -1;
if (bios[offset] != 'P' ||
bios[offset+1] != 'C' ||
bios[offset+2] != 'I' ||
@ -1299,7 +1302,7 @@ int main(int argc, char **argv)
printf("\n");
if (devid == -1)
devid = get_device_id(VBIOS);
devid = get_device_id(VBIOS, size);
if (devid == -1)
printf("Warning: could not find PCI device ID!\n");