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fstk_FindFile checks for sprintf failure

--- a/src/asm/fstack.c

+++ b/src/asm/fstack.c

@@ -191,6 +191,11 @@

 					break;

 				}

 				len = sprintf(*fullPath, "%s%s", incPath, path);

+				if (len < 0) {

+					error("sprintf error during include path search: %s\n",

+					       strerror(errno));

+					break;

+				}

 			}

 			if (isPathValid(*fullPath)) {