Fix potential memory access violation in ecpg if filename of include file is

Michael Meskes · Michael Meskes · commit 5469a1e78c92 · 2019-03-11T16:15:09.000+01:00
shorter than 2 characters.

Patch by: "Wu, Fei" &lt;wufei.fnst@cn.fujitsu.com&gt;
diff --git a/src/interfaces/ecpg/preproc/pgc.l b/src/interfaces/ecpg/preproc/pgc.l
@@ -1393,7 +1393,7 @@ parse_include(void)
 		yyin = fopen(inc_file, "r");
 		if (!yyin)
 		{
-			if (strcmp(inc_file + strlen(inc_file) - 2, ".h") != 0)
+			if (strlen(inc_file) <= 2 || strcmp(inc_file + strlen(inc_file) - 2, ".h") != 0)
 			{
 				strcat(inc_file, ".h");
 				yyin = fopen(inc_file, "r");

Original file line number	Diff line number	Diff line change
`@@ -1393,7 +1393,7 @@ parse_include(void)`
`1393`	`1393`	`yyin = fopen(inc_file, "r");`
`1394`	`1394`	`if (!yyin)`
`1395`	`1395`	`{`
`1396`		`- if (strcmp(inc_file + strlen(inc_file) - 2, ".h") != 0)`
	`1396`	`+ if (strlen(inc_file) <= 2 \|\| strcmp(inc_file + strlen(inc_file) - 2, ".h") != 0)`
`1397`	`1397`	`{`
`1398`	`1398`	`strcat(inc_file, ".h");`
`1399`	`1399`	`yyin = fopen(inc_file, "r");`