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-rw-r--r--scripts/coccinelle/api/device_attr_show.cocci55
1 files changed, 55 insertions, 0 deletions
diff --git a/scripts/coccinelle/api/device_attr_show.cocci b/scripts/coccinelle/api/device_attr_show.cocci
new file mode 100644
index 000000000000..d8ec4bb8ac41
--- /dev/null
+++ b/scripts/coccinelle/api/device_attr_show.cocci
@@ -0,0 +1,55 @@
+// SPDX-License-Identifier: GPL-2.0-only
+///
+/// From Documentation/filesystems/sysfs.txt:
+/// show() must not use snprintf() when formatting the value to be
+/// returned to user space. If you can guarantee that an overflow
+/// will never happen you can use sprintf() otherwise you must use
+/// scnprintf().
+///
+// Confidence: High
+// Copyright: (C) 2020 Denis Efremov ISPRAS
+// Options: --no-includes --include-headers
+//
+
+virtual report
+virtual org
+virtual context
+virtual patch
+
+@r depends on !patch@
+identifier show, dev, attr, buf;
+position p;
+@@
+
+ssize_t show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+ <...
+* return snprintf@p(...);
+ ...>
+}
+
+@rp depends on patch@
+identifier show, dev, attr, buf;
+@@
+
+ssize_t show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+ <...
+ return
+- snprintf
++ scnprintf
+ (...);
+ ...>
+}
+
+@script: python depends on report@
+p << r.p;
+@@
+
+coccilib.report.print_report(p[0], "WARNING: use scnprintf or sprintf")
+
+@script: python depends on org@
+p << r.p;
+@@
+
+coccilib.org.print_todo(p[0], "WARNING: use scnprintf or sprintf")