wasm_application.c: Avoid null pointer dereference (#3620)

HongxiaWangSSSS · web-flow · commit 7affac0ed35d · 2024-07-12T16:59:59.000+08:00
diff --git a/core/iwasm/common/wasm_application.c b/core/iwasm/common/wasm_application.c
@@ -513,7 +513,7 @@ execute_func(WASMModuleInstanceCommon *module_inst, const char *name,
                         bh_memcpy_s(&u.val, sizeof(double), &ud.d,
                                     sizeof(double));
                     }
-                    if (endptr[0] == ':') {
+                    if (endptr && endptr[0] == ':') {
                         uint64 sig;
                         union ieee754_double ud;
                         sig = strtoull(endptr + 1, &endptr, 0);

Original file line number	Diff line number	Diff line change
`@@ -513,7 +513,7 @@ execute_func(WASMModuleInstanceCommon module_inst, const char name,`
`513`	`513`	`bh_memcpy_s(&u.val, sizeof(double), &ud.d,`
`514`	`514`	`sizeof(double));`
`515`	`515`	`}`
`516`		`- if (endptr[0] == ':') {`
	`516`	`+ if (endptr && endptr[0] == ':') {`
`517`	`517`	`uint64 sig;`
`518`	`518`	`union ieee754_double ud;`
`519`	`519`	`sig = strtoull(endptr + 1, &endptr, 0);`