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Fixed netconn_gethostbyname for LWIP_MPU_COMPATIBLE: removed invalid check on 'addr', copy 'name' since it could be located on the caller's stack

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This commit is contained in:
Simon Goldschmidt 2014-02-21 09:04:39 +01:00
parent 4d69d0eda5
commit fc158ad5c0
2 changed files with 8 additions and 5 deletions
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9
src/api/api_lib.c
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@ -829,20 +829,19 @@ netconn_gethostbyname(const char *name, ip_addr_t *addr)
API_VAR_ALLOC(struct dns_api_msg, MEMP_DNS_API_MSG, msg);
#if LWIP_MPU_COMPATIBLE
if (addr == NULL) {
addr = IP_ADDR_ANY;
}
#else
strncpy(API_VAR_REF(msg).name, name, DNS_MAX_NAME_LENGTH-1);
API_VAR_REF(msg).name[DNS_MAX_NAME_LENGTH-1] = 0;
#else /* LWIP_MPU_COMPATIBLE */
msg.err = &err;
msg.sem = &sem;
API_VAR_REF(msg).addr = API_VAR_REF(addr);
API_VAR_REF(msg).name = name;
#endif /* LWIP_MPU_COMPATIBLE */
err = sys_sem_new(API_EXPR_REF(API_VAR_REF(msg).sem), 0);
if (err != ERR_OK) {
API_VAR_FREE(MEMP_DNS_API_MSG, msg);
return err;
}
API_VAR_REF(msg).name = name;
tcpip_callback(lwip_netconn_do_gethostbyname, &API_VAR_REF(msg));
sys_sem_wait(API_EXPR_REF(API_VAR_REF(msg).sem));

4
src/include/lwip/api_msg.h
View File

@ -140,7 +140,11 @@ struct api_msg {
(see netconn_gethostbyname). */
struct dns_api_msg {
/** Hostname to query or dotted IP address string */
#if LWIP_MPU_COMPATIBLE
char name[DNS_MAX_NAME_LENGTH];
#else /* LWIP_MPU_COMPATIBLE */
const char *name;
#endif /* LWIP_MPU_COMPATIBLE */
/** Rhe resolved address is stored here */
ip_addr_t API_MSG_M_DEF(addr);
/** This semaphore is posted when the name is resolved, the application thread