Which version of lwIP are you using? This was a bug in 1.3.0 that has been fixed in 1.3.1, if I remember correctly. Try upgrading to the latest version to fix this.
Simon -------- Original-Nachricht -------- > Datum: Tue, 1 Sep 2009 09:44:09 +0200 > Von: Martin Velek <[email protected]> > An: [email protected] > Betreff: [lwip-users] pbuf_realloc in ip.c problem > Hello, > > I am using lwip 1.3.1 with FreeRTOS and LM3S9B92. Because there is a > memory manager in the OS I have defined > #define MEM_LIBC_MALLOC 1 > #define MEMP_MEM_MALLOC 1 > #define MEM_USE_POOLS 0 > with bget implementation of memory manager. All incomming packets are > PBUF_RAM. > > The lwip running fine until a tcp packet to port 80 is received(http > server by netconn). The lwip will cause a invalid memory access. > > During debuging I have discovered that in file ip.c is called > pbuf_realloc(p, iphdr_len) and inside this function is called > mem_realloc(brel). Unfortunately bget reallocate memory by creating a > new space and than will free the old memory. > However this new memory is "lost" because the new pointer is not > stored. (q = mem_realloc(q, (u8_t *)q->payload - (u8_t *)q + > rem_len);) and q is not stored back to "p". > So, p is still pointing to the deallocated memory. > I have thought that the bget implementation is wrong but the standard > C's realloc returns: > "A pointer to the reallocated memory block, which may be either the > same as the ptr argument or a new location. > The type of this pointer is void*, which can be cast to the desired > type of data pointer in order to be dereferenceable. > If the function failed to allocate the requested block of memory, a > NULL pointer is returned." > > Have anyone next similar problem? > > Thank you for your reply. > > Regards, > Martin Velek > > > _______________________________________________ > lwip-users mailing list > [email protected] > http://lists.nongnu.org/mailman/listinfo/lwip-users -- Jetzt kostenlos herunterladen: Internet Explorer 8 und Mozilla Firefox 3 - sicherer, schneller und einfacher! http://portal.gmx.net/de/go/chbrowser _______________________________________________ lwip-users mailing list [email protected] http://lists.nongnu.org/mailman/listinfo/lwip-users
