On Mon, May 26, 2014 at 09:53:56PM +0200, Konrad Zapalowicz wrote:
> - DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO " SIOCGIWAPLIST \n");
> - // Only super-user can see AP list
> + DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO " SIOCGIWAPLIST\n");
>
> + /* Can we even enter the game?
> + * 1. only super-user can see AP list
> + * 2. pointer must be valid */
These comments are obvious, just delete them instead of reformating.
> if (!capable(CAP_NET_ADMIN)) {
> rc = -EPERM;
> - return rc;
> + goto exit;
> }
>
> - if (wrq->pointer) {
> - PKnownBSS pBSS = &(pMgmt->sBSSList[0]);
> + if (!wrq->pointer)
> + goto exit;
>
> - for (ii = 0, jj = 0; ii < MAX_BSS_NUM; ii++) {
> - pBSS = &(pMgmt->sBSSList[ii]);
> - if (!pBSS->bActive)
> - continue;
> - if (jj >= IW_MAX_AP)
> - break;
> - memcpy(sock[jj].sa_data, pBSS->abyBSSID, 6);
> - sock[jj].sa_family = ARPHRD_ETHER;
> - qual[jj].level = pBSS->uRSSI;
> - qual[jj].qual = qual[jj].noise = 0;
> - qual[jj].updated = 2;
> - jj++;
> - }
> + /* Allocate tmp tables. Must be on the heap, otherwise the
> + * frame size is too big (exceeds 1024B) */
This comment is also pretty obvious. Just leave it out.
> + sock = kmalloc_array(IW_MAX_AP, sizeof(struct sockaddr), GFP_KERNEL);
> + if (!sock) {
> + rc = -ENOMEM;
> + goto exit;
> + }
> +
> + qual = kmalloc_array(IW_MAX_AP, sizeof(struct iw_quality), GFP_KERNEL);
> + if (!qual) {
> + rc = -ENOMEM;
> + goto exit;
> + }
> +
> + pBSS = &(pMgmt->sBSSList[0]);
No need. This is initialized inside the loop.
> +
> + for (ii = 0, jj = 0; ii < MAX_BSS_NUM; ii++) {
> + pBSS = &(pMgmt->sBSSList[ii]);
> +
> + if (!pBSS->bActive)
> + continue;
> + if (jj >= IW_MAX_AP)
> + break;
> +
> + s = sock + sizeof(struct sockaddr) * jj;
> + q = qual + sizeof(struct iw_quality) * jj;
The pointer math is wrong here and will cause memory corruption. These
are struct pointers and not void pointers, or char pointers like "extra"
is. It should just be:
q = qual + jj;
Or even better:
s = &sock[jj];
q = &qual[jj];
>
> - wrq->flags = 1; // Should be define'd
> - wrq->length = jj;
> - memcpy(extra, sock, sizeof(struct sockaddr)*jj);
> - memcpy(extra + sizeof(struct sockaddr)*jj, qual, sizeof(struct
> iw_quality)*jj);
Fix it up and send a v2.
regards,
dan carpenter
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