[dpdk-dev] [PATCH] usertools: check 0-division with hugepage size

Thomas Monjalon thomas at monjalon.net
Thu Feb 11 23:05:44 CET 2021

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 at 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)
         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:

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