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List: intel-wired-lan
Subject: [Intel-wired-lan] [PATCH net-next v3 2/3] checkpatch: add ethtool_sprintf rules
From: Justin Stitt <justinstitt () google ! com>
Date: 2023-10-27 22:05:34
Message-ID: 20231027-ethtool_puts_impl-v3-2-3466ac679304 () google ! com
[Download RAW message or body]
Add some warnings for using ethtool_sprintf() where a simple
ethtool_puts() would suffice.
The two cases are:
1) Use ethtool_sprintf() with just two arguments:
> ethtool_sprintf(&data, driver[i].name);
or
2) Use ethtool_sprintf() with a standalone "%s" fmt string:
> ethtool_sprintf(&data, "%s", driver[i].name);
The former may cause -Wformat-security warnings while the latter is just
not preferred. Both are safely in the category of warnings, not errors.
Signed-off-by: Justin Stitt <justinstitt@google.com>
---
scripts/checkpatch.pl | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)
diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 7d16f863edf1..9369ce1d15c5 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -7020,6 +7020,25 @@ sub process {
"Prefer strscpy, strscpy_pad, or __nonstring over strncpy - see: \
https://github.com/KSPP/linux/issues/90\n" . $herecurr); }
+# ethtool_sprintf uses that should likely be ethtool_puts
+ if ($line =~ /\bethtool_sprintf\s*\(\s*$FuncArg\s*,\s*$FuncArg\s*\)/) {
+ if (WARN("PREFER_ETHTOOL_PUTS",
+ "Prefer ethtool_puts over ethtool_sprintf with only two arguments\n" . \
$herecurr) && + $fix) {
+ $fixed[$fixlinenr] =~ \
s/\bethtool_sprintf\s*\(\s*($FuncArg)\s*,\s*($FuncArg)/ethtool_puts($1, $7)/; + }
+ }
+
+ # use $rawline because $line loses %s via sanitization and thus we can't match \
against it. + if ($rawline =~ \
/\bethtool_sprintf\s*\(\s*$FuncArg\s*,\s*\"\%s\"\s*,\s*$FuncArg\s*\)/) { + if \
(WARN("PREFER_ETHTOOL_PUTS", + "Prefer ethtool_puts over ethtool_sprintf with \
standalone \"%s\" specifier\n" . $herecurr) && + $fix) {
+ $fixed[$fixlinenr] =~ \
s/\bethtool_sprintf\s*\(\s*($FuncArg)\s*,\s*"\%s"\s*,\s*($FuncArg)/ethtool_puts($1, \
$7)/; + }
+ }
+
+
# typecasts on min/max could be min_t/max_t
if ($perl_version_ok &&
defined $stat &&
--
2.42.0.820.g83a721a137-goog
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