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From 024103923a5c826e40c993be4ee2ada5536cb66a Mon Sep 17 00:00:00 2001
From: Petr Machata <petrm@nvidia.com>
Date: Mon, 27 Jun 2022 15:18:21 +0200
Subject: [PATCH] ip: Fix size_columns() for very large values
For values near the 64-bit boundary, the iterative application of
powi *= 10 causes powi to overflow without the termination condition of
powi >= val having ever been satisfied. Instead, when determining the
length of the number, iterate val /= 10 and terminate when it's a single
digit.
Fixes: 49437375b6c1 ("ip: dynamically size columns when printing stats")
CC: Tariq Toukan <tariqt@nvidia.com>
CC: Itay Aveksis <itayav@nvidia.com>
Signed-off-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Conflict: void size_columns to static void size_colunms
Reference: https://git.kernel.org/pub/scm/network/iproute2/iproute2.git/commit?id=024103923a5
---
ip/ipaddress.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/ip/ipaddress.c b/ip/ipaddress.c
index 17341d28..5a3b1cae 100644
--- a/ip/ipaddress.c
+++ b/ip/ipaddress.c
@@ -549,7 +549,7 @@ static void print_vfinfo(FILE *fp, struct ifinfomsg *ifi, struct rtattr *vfinfo)
static void size_columns(unsigned int cols[], unsigned int n, ...)
{
unsigned int i, len;
- uint64_t val, powi;
+ uint64_t val;
va_list args;
va_start(args, n);
@@ -560,7 +560,7 @@ void size_columns(unsigned int cols[], unsigned int n, ...)
if (human_readable)
continue;
- for (len = 1, powi = 10; powi < val; len++, powi *= 10)
+ for (len = 1; val > 9; len++, val /= 10)
/* nothing */;
if (len > cols[i])
cols[i] = len;
--
2.23.0
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