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xf86AutoConfig: make copyScreen memory allocation & error handling more sane

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No point calling the no-fail-alloc if you check for failure and your
only caller checks for failure.

No point calling calloc to zero fill memory you're about to memcpy over.

In the unlikely event of a loss of memory allocation, drop your previous
allocations before returning to others.

Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>
Reviewed-by: Julien Cristau <jcristau@debian.org>
Reviewed-by: Mikhail Gusarov <dottedmag@dottedmag.net>
This commit is contained in:
Alan Coopersmith
2010-11-27 19:06:56 -08:00
parent 2c8e534c8e
commit 4bbc90cd8b
1 changed files with 15 additions and 5 deletions
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20
hw/xfree86/common/xf86AutoConfig.c
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@@ -282,21 +282,31 @@ listPossibleVideoDrivers(char *matches[], int nmatches)
static Bool
copyScreen(confScreenPtr oscreen, GDevPtr odev, int i, char *driver)
{
confScreenPtr nscreen;
GDevPtr cptr = NULL;
xf86ConfigLayout.screens[i].screen = xnfcalloc(1, sizeof(confScreenRec));
if(!xf86ConfigLayout.screens[i].screen)
nscreen = malloc(sizeof(confScreenRec));
if (!nscreen)
return FALSE;
memcpy(xf86ConfigLayout.screens[i].screen, oscreen, sizeof(confScreenRec));
memcpy(nscreen, oscreen, sizeof(confScreenRec));
cptr = calloc(1, sizeof(GDevRec));
if (!cptr)
cptr = malloc(sizeof(GDevRec));
if (!cptr) {
free(nscreen);
return FALSE;
}
memcpy(cptr, odev, sizeof(GDevRec));
cptr->identifier = Xprintf("Autoconfigured Video Device %s", driver);
if (!cptr->identifier) {
free(cptr);
free(nscreen);
return FALSE;
}
cptr->driver = driver;
xf86ConfigLayout.screens[i].screen = nscreen;
/* now associate the new driver entry with the new screen entry */
xf86ConfigLayout.screens[i].screen->device = cptr;
cptr->myScreenSection = xf86ConfigLayout.screens[i].screen;