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xfree86: Remove the pretense of EDID v2 support

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We don't do anything with EDID v2 blocks besides publish them on the
root window.  Worse, the check deleted by this patch would attempt to
take a checksum of arbitrary memory if the rawData array isn't 256+
bytes long (and, for the monitors mentioned, it probably is only 128).

Reviewed-by: Mark Kettenis <kettenis@openbsd.org>
Signed-off-by: Adam Jackson <ajax@redhat.com>
This commit is contained in:
Adam Jackson 2011-07-18 15:07:07 -04:00
parent 8f9bdfd293
commit 777bf90abe
1 changed files with 4 additions and 43 deletions
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47
hw/xfree86/ddc/ddcProperty.c
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@ -33,7 +33,6 @@
#include <string.h>
#define EDID1_ATOM_NAME "XFree86_DDC_EDID1_RAWDATA"
#define EDID2_ATOM_NAME "XFree86_DDC_EDID2_RAWDATA"
static void
edidMakeAtom(int i, const char *name, CARD8 *data, int size)
@ -52,59 +51,21 @@ edidMakeAtom(int i, const char *name, CARD8 *data, int size)
static void
addRootWindowProperties(ScrnInfoPtr pScrn, xf86MonPtr DDC)
{
int i, scrnIndex = pScrn->scrnIndex;
Bool makeEDID1prop = FALSE;
Bool makeEDID2prop = FALSE;
int scrnIndex = pScrn->scrnIndex;
if (DDC->flags & MONITOR_DISPLAYID) {
/* Don't bother, use RANDR already */
return;
} else if (DDC->ver.version == 1) {
makeEDID1prop = TRUE;
} else if (DDC->ver.version == 2) {
int checksum1;
int checksum2;
makeEDID2prop = TRUE;
int size = 128 +
(DDC->flags & EDID_COMPLETE_RAWDATA ? DDC->no_sections * 128 : 0);
/* Some monitors (eg Panasonic PanaSync4)
* report version==2 because they used EDID v2 spec document,
* although they use EDID v1 data structure :-(
*
* Try using checksum to determine when we have such a monitor.
*/
checksum2 = 0;
for (i = 0; i < 256; i++)
checksum2 += DDC->rawData[i];
if (checksum2 % 256) {
xf86DrvMsg(scrnIndex, X_INFO, "Monitor EDID v2 checksum failed\n");
xf86DrvMsg(scrnIndex, X_INFO,
"XFree86_DDC_EDID2_RAWDATA property may be bad\n");
checksum1 = 0;
for (i = 0; i < 128; i++)
checksum1 += DDC->rawData[i];
if (!(checksum1 % 256)) {
xf86DrvMsg(scrnIndex, X_INFO,
"Monitor EDID v1 checksum passed,\n");
xf86DrvMsg(scrnIndex, X_INFO,
"XFree86_DDC_EDID1_RAWDATA property created\n");
makeEDID1prop = TRUE;
}
}
edidMakeAtom(scrnIndex, EDID1_ATOM_NAME, DDC->rawData, size);
} else {
xf86DrvMsg(scrnIndex, X_PROBED, "unexpected EDID version %d.%d\n",
DDC->ver.version, DDC->ver.revision);
return;
}
if (makeEDID1prop) {
int size = 128 +
(DDC->flags & EDID_COMPLETE_RAWDATA ? DDC->no_sections * 128 : 0);
edidMakeAtom(scrnIndex, EDID1_ATOM_NAME, DDC->rawData, size);
}
if (makeEDID2prop)
edidMakeAtom(scrnIndex, EDID2_ATOM_NAME, DDC->rawData, 256);
}
Bool