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gre: check nil for pullupblock()

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This commit is contained in:
cinap_lenrek 2016-11-08 22:33:19 +01:00
parent 58fe71b2f5
commit ba38aa8b9d
1 changed files with 4 additions and 5 deletions
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9
sys/src/9/ip/gre.c
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@ -300,6 +300,8 @@ grekick(void *x, Block *bp)
/* make sure the message has a GRE header */
bp = pullupblock(bp, GRE_IPONLY+GRE_IPPLUSGRE);
if(bp == nil)
return;
gre = (GREhdr *)bp->rp;
gre->vihl = IP_VER4;
@ -528,11 +530,8 @@ greiput(Proto *proto, Ipifc *, Block *bp)
* that when the block is forwarded, devether.c puts the block into
* a queue that also uses ->next. Just do not use ->next here!
*/
if(bp->next){
len = blocklen(bp);
bp = pullupblock(bp, len);
assert(BLEN(bp) == len && bp->next == nil);
}
if(bp->next != nil)
bp = pullupblock(bp, blocklen(bp));
gre = (GREhdr *)bp->rp;
if(BLEN(bp) < sizeof(GREhdr) || gre->proto != IP_GREPROTO){