DPDK patches and discussions
 help / color / mirror / Atom feed
From: Thomas Monjalon <thomas@monjalon.net>
To: dev@dpdk.org
Cc: sarosh.arif@emumba.com, stephen@networkplumber.org
Subject: [dpdk-dev] [PATCH] usertools: check 0-division with hugepage size
Date: Thu, 11 Feb 2021 23:05:44 +0100
Message-ID: <20210211220544.55439-1-thomas@monjalon.net> (raw)

The default page size can be None, and the page size from user request
can be 0 kB if lower than 1024. In these cases, a division will fail.
In order to avoid a Python exception, the page size is checked
and an error message "Invalid page size" is printed.

A similar error message is printed in set_hugepages()
if the size is not supported, except at this stage the message can be
completed with "Valid page sizes".
Unfortunately the first check is too early to print such information.

A third error message can be printed in a different place (get_memsize)
in case of a format issue, e.g. a negative size.
The function get_memsize() is also used for total requested size,
so the error message "not a valid page size" was potentially wrong.
This message is replaced with the more general "is not a valid size".

Signed-off-by: Thomas Monjalon <thomas@monjalon.net>
---
 usertools/dpdk-hugepages.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/usertools/dpdk-hugepages.py b/usertools/dpdk-hugepages.py
index fb368b6933..c1f2549ec0 100755
--- a/usertools/dpdk-hugepages.py
+++ b/usertools/dpdk-hugepages.py
@@ -29,7 +29,7 @@ def get_memsize(arg):
     '''Convert memory size with suffix to kB'''
     match = re.match(r'(\d+)([' + BINARY_PREFIX + r']?)$', arg.upper())
     if match is None:
-        sys.exit('{} is not a valid page size'.format(arg))
+        sys.exit('{} is not a valid size'.format(arg))
     num = float(match.group(1))
     suffix = match.group(2)
     if suffix == "":
@@ -254,6 +254,8 @@ def main():
         pagesize_kb = get_memsize(args.pagesize)
     else:
         pagesize_kb = default_pagesize()
+    if pagesize_kb is None or pagesize_kb == 0:
+        sys.exit("Invalid page size: {}kB".format(pagesize_kb))
 
     if args.clear:
         clear_pages()
-- 
2.30.0


             reply	other threads:[~2021-02-11 22:05 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-11 22:05 Thomas Monjalon [this message]
2021-02-11 23:18 ` Stephen Hemminger
2021-02-12 11:27 ` Burakov, Anatoly
2021-02-12 11:34   ` Thomas Monjalon
2021-03-21  9:09 ` [dpdk-dev] [PATCH v2] " Thomas Monjalon
2021-03-23 11:30   ` Burakov, Anatoly
2021-03-25 17:04     ` Thomas Monjalon

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20210211220544.55439-1-thomas@monjalon.net \
    --to=thomas@monjalon.net \
    --cc=dev@dpdk.org \
    --cc=sarosh.arif@emumba.com \
    --cc=stephen@networkplumber.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

DPDK patches and discussions

This inbox may be cloned and mirrored by anyone:

	git clone --mirror https://inbox.dpdk.org/dev/0 dev/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 dev dev/ https://inbox.dpdk.org/dev \
		dev@dpdk.org
	public-inbox-index dev

Example config snippet for mirrors.
Newsgroup available over NNTP:
	nntp://inbox.dpdk.org/inbox.dpdk.dev


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git