Fix a memleak in ParsePixels error code path

In this particular error path we have already allocated cidx[0..256]
with 256 instances of fresh and juicy memory. Freeing that is annoying,
but luckily there's a helpful FREE_CIDX macro that does exactly that.

Fixes f80fa6a:
  Fix CVE-2022-44617: Runaway loop with width of 0 and enormous height

Found by covscan

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>

1 files changed, 1 insertions, 0 deletions

diff --git a/src/parse.c b/src/parse.c
index 64f51ba..2bb3f0e 100644
--- a/src/parse.c
+++ b/src/parse.c
@@ -524,6 +524,7 @@ do \
 	    for (y = 0; y < height; y++) {
 		ErrorStatus = xpmNextString(data);
 		if (ErrorStatus != XpmSuccess) {
+		    FREE_CIDX;
 		    XpmFree(iptr2);
 		    return (ErrorStatus);
 		}