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Added check to not copy or create too large packets

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This commit is contained in:
nifi 2010-05-02 14:59:11 +00:00
parent a04372adc4
commit 6c86398778
1 changed files with 6 additions and 2 deletions
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8
core/net/rime/packetbuf.c
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@ -33,7 +33,7 @@
* *
* This file is part of the Contiki operating system. * This file is part of the Contiki operating system.
* *
* $Id: packetbuf.c,v 1.8 2010/04/26 22:05:40 nifi Exp $ * $Id: packetbuf.c,v 1.9 2010/05/02 14:59:11 nifi Exp $
*/ */
/** /**
@ -159,6 +159,10 @@ packetbuf_copyto(void *to)
PRINTF("packetbuf_write: data: %s\n", buffer); PRINTF("packetbuf_write: data: %s\n", buffer);
} }
#endif /* DEBUG_LEVEL */ #endif /* DEBUG_LEVEL */
if(PACKETBUF_HDR_SIZE - hdrptr + buflen > PACKETBUF_SIZE) {
/* Too large packet */
return 0;
}
memcpy(to, packetbuf + hdrptr, PACKETBUF_HDR_SIZE - hdrptr); memcpy(to, packetbuf + hdrptr, PACKETBUF_HDR_SIZE - hdrptr);
memcpy((uint8_t *)to + PACKETBUF_HDR_SIZE - hdrptr, packetbufptr + bufptr, memcpy((uint8_t *)to + PACKETBUF_HDR_SIZE - hdrptr, packetbufptr + bufptr,
buflen); buflen);
@ -168,7 +172,7 @@ packetbuf_copyto(void *to)
int int
packetbuf_hdralloc(int size) packetbuf_hdralloc(int size)
{ {
if(hdrptr >= size) { if(hdrptr >= size && packetbuf_totlen() + size <= PACKETBUF_SIZE) {
hdrptr -= size; hdrptr -= size;
return 1; return 1;
} }