libgd patch for CVE-2026-9672

Patch by Pierre Joye (pierrejoye).

Author: iluuu1994

ext/gd/libgd/gd_gif_in.c

@@ -450,7 +450,7 @@ LWZReadByte_(gdIOCtx *fd, LZW_STATIC_DATA *sd, char flag, int input_code_size, i
 			sd->table[1][i] = i;
 		}
 		for (; i < (1<<MAX_LWZ_BITS); ++i)
-			sd->table[0][i] = sd->table[1][0] = 0;
+			sd->table[0][i] = sd->table[1][i] = 0;
 
 		sd->sp = sd->stack;
 
@@ -494,6 +494,8 @@ LWZReadByte_(gdIOCtx *fd, LZW_STATIC_DATA *sd, char flag, int input_code_size, i
 
 			if (count != 0)
 				return -2;
+
+			return -2;
 		}
 
 		incode = code;
@@ -560,7 +562,7 @@ ReadImage(gdImagePtr im, gdIOCtx *fd, int len, int height, unsigned char (*cmap)
 	int             v;
 	int             xpos = 0, ypos = 0, pass = 0;
 	int i;
-	LZW_STATIC_DATA sd;
+	LZW_STATIC_DATA sd = {0};
 
 
 	/*