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xkb: fix invalid memory writes in _XkbCopyGeom. 

Classic strlen/strcpy mistake of
   foo = malloc(strlen(bar));
   strcpy(foo, bar);

Testcase: valgrind Xephyr :1

==8591== Invalid write of size 1
==8591==    at 0x4A0638F: strcpy (mc_replace_strmem.c:311)
==8591==    by 0x605593: _XkbCopyGeom (xkbUtils.c:1994)
==8591==    by 0x605973: XkbCopyKeymap (xkbUtils.c:2118)
==8591==    by 0x6122B3: InitKeyboardDeviceStruct (xkbInit.c:560)
==8591==    by 0x4472E2: CoreKeyboardProc (devices.c:577)
==8591==    by 0x447162: ActivateDevice (devices.c:530)
==8591==    by 0x4475D6: InitCoreDevices (devices.c:672)
==8591==    by 0x4449EE: main (main.c:254)
==8591==  Address 0x6f96505 is 0 bytes after a block of size 53 alloc'd
==8591==    at 0x4A0515D: malloc (vg_replace_malloc.c:195)
==8591==    by 0x6054B7: _XkbCopyGeom (xkbUtils.c:1980)
==8591==    by 0x605973: XkbCopyKeymap (xkbUtils.c:2118)
==8591==    by 0x6122B3: InitKeyboardDeviceStruct (xkbInit.c:560)
==8591==    by 0x4472E2: CoreKeyboardProc (devices.c:577)
==8591==    by 0x447162: ActivateDevice (devices.c:530)
==8591==    by 0x4475D6: InitCoreDevices (devices.c:672)
==8591==    by 0x4449EE: main (main.c:254)

Reported-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by-and-apologised-for: Daniel Stone <daniel@fooishbar.org>
Signed-off-by: Keith Packard <keithp@keithp.com>
This commit is contained in:
Peter Hutterer 2010-06-04 14:15:04 +10:00 committed by Keith Packard
parent 959a1eaf1c
commit 7f19a7a6e9
1 changed files with 2 additions and 2 deletions
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4
xkb/xkbUtils.c
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@ -1977,7 +1977,7 @@ _XkbCopyGeom(XkbDescPtr src, XkbDescPtr dst)
/* font */
if (src->geom->label_font) {
if (!dst->geom->label_font) {
tmp = malloc(strlen(src->geom->label_font));
tmp = malloc(strlen(src->geom->label_font) + 1);
if (!tmp)
return FALSE;
dst->geom->label_font = tmp;
@ -1985,7 +1985,7 @@ _XkbCopyGeom(XkbDescPtr src, XkbDescPtr dst)
else if (strlen(src->geom->label_font) !=
strlen(dst->geom->label_font)) {
tmp = realloc(dst->geom->label_font,
strlen(src->geom->label_font));
strlen(src->geom->label_font) + 1);
if (!tmp)
return FALSE;
dst->geom->label_font = tmp;