Skip to main content

Browse the archive

https://github.com/torvalds/linux
13 June 2022, 11:31:42 UTC
Revision d9e15a2733067c9328fb56d98fe8e574fa19ec31 authored by Eric Dumazet on 06 January 2020, 14:10:39 UTC, committed by David S. Miller on 08 January 2020, 20:40:47 UTC 
pkt_sched: fq: do not accept silly TCA_FQ_QUANTUM
 
As diagnosed by Florian :

If TCA_FQ_QUANTUM is set to 0x80000000, fq_deueue()
can loop forever in :

if (f->credit <= 0) {
  f->credit += q->quantum;
  goto begin;
}

... because f->credit is either 0 or -2147483648.

Let's limit TCA_FQ_QUANTUM to no more than 1 << 20 :
This max value should limit risks of breaking user setups
while fixing this bug.

Fixes: afe4fd062416 ("pkt_sched: fq: Fair Queue packet scheduler")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Diagnosed-by: Florian Westphal <fw@strlen.de>
Reported-by: syzbot+dc9071cc5a85950bdfce@syzkaller.appspotmail.com
Signed-off-by: David S. Miller <davem@davemloft.net>
1 parent b969fee
History
Tip revision: d9e15a2733067c9328fb56d98fe8e574fa19ec31 authored by Eric Dumazet on 06 January 2020, 14:10:39 UTC
pkt_sched: fq: do not accept silly TCA_FQ_QUANTUM
Tip revision: d9e15a2
File Mode Size
Documentation
LICENSES
arch
block
certs
crypto
drivers
fs
include
init
ipc
kernel
lib
mm
net
samples
scripts
security
sound
tools
usr
virt
.clang-format -rw-r--r-- 15.0 KB
.cocciconfig -rw-r--r-- 59 bytes
.get_maintainer.ignore -rw-r--r-- 71 bytes
.gitattributes -rw-r--r-- 62 bytes
.gitignore -rw-r--r-- 1.7 KB
.mailmap -rw-r--r-- 14.1 KB
COPYING -rw-r--r-- 423 bytes
CREDITS -rw-r--r-- 97.3 KB
Kbuild -rw-r--r-- 1.3 KB
Kconfig -rw-r--r-- 595 bytes
MAINTAINERS -rw-r--r-- 526.7 KB
Makefile -rw-r--r-- 59.4 KB
README -rw-r--r-- 727 bytes

README

back to top