proxmox-mirrors/mirror_frr
1
0
Fork 0
mirror of https://git.proxmox.com/git/mirror_frr synced 2025-08-15 09:20:25 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

pimd: fix negative bitshift

Browse Source 
Valid range for hashmasklen is 0-32 under IPv4; failure to validate this
results in a negative bitshift later

Signed-off-by: Quentin Young <qlyoung@cumulusnetworks.com>
This commit is contained in:
Quentin Young 2020-04-05 23:40:47 -04:00
parent 70ecc066e7
commit 817f893343
1 changed files with 7 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
pimd/pim_bsm.c
View File

@ -1282,6 +1282,13 @@ int pim_bsm_process(struct interface *ifp, struct ip *ip_hdr, uint8_t *buf,
bshdr = (struct bsm_hdr *)(buf + PIM_MSG_HEADER_LEN);
pim_inet4_dump("<bsr?>", bshdr->bsr_addr.addr, bsr_str,
sizeof(bsr_str));
if (bshdr->hm_len > 32) {
zlog_warn("Bad hashmask length for IPv4; got %" PRIu8
", expected value in range 0-32",
bshdr->hm_len);
pim->bsm_dropped++;
return -1;
}
pim->global_scope.hashMasklen = bshdr->hm_len;
frag_tag = ntohs(bshdr->frag_tag);