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Diffstat (limited to 'lib/vsprintf.c')
-rw-r--r--lib/vsprintf.c27
1 files changed, 27 insertions, 0 deletions
diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index e78017a3e1bd..b54d252b398e 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -21,6 +21,7 @@
#include <linux/build_bug.h>
#include <linux/clk.h>
#include <linux/clk-provider.h>
+#include <linux/errname.h>
#include <linux/module.h> /* for KSYM_SYMBOL_LEN */
#include <linux/types.h>
#include <linux/string.h>
@@ -613,6 +614,25 @@ static char *string_nocheck(char *buf, char *end, const char *s,
return widen_string(buf, len, end, spec);
}
+static char *err_ptr(char *buf, char *end, void *ptr,
+ struct printf_spec spec)
+{
+ int err = PTR_ERR(ptr);
+ const char *sym = errname(err);
+
+ if (sym)
+ return string_nocheck(buf, end, sym, spec);
+
+ /*
+ * Somebody passed ERR_PTR(-1234) or some other non-existing
+ * Efoo - or perhaps CONFIG_SYMBOLIC_ERRNAME=n. Fall back to
+ * printing it as its decimal representation.
+ */
+ spec.flags |= SIGN;
+ spec.base = 10;
+ return number(buf, end, err, spec);
+}
+
/* Be careful: error messages must fit into the given buffer. */
static char *error_string(char *buf, char *end, const char *s,
struct printf_spec spec)
@@ -2187,6 +2207,11 @@ char *pointer(const char *fmt, char *buf, char *end, void *ptr,
return kobject_string(buf, end, ptr, spec, fmt);
case 'x':
return pointer_string(buf, end, ptr, spec);
+ case 'e':
+ /* %pe with a non-ERR_PTR gets treated as plain %p */
+ if (!IS_ERR(ptr))
+ break;
+ return err_ptr(buf, end, ptr, spec);
}
/* default is to _not_ leak addresses, hash before printing */
@@ -2823,6 +2848,7 @@ int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args)
case 'f':
case 'x':
case 'K':
+ case 'e':
save_arg(void *);
break;
default:
@@ -2999,6 +3025,7 @@ int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf)
case 'f':
case 'x':
case 'K':
+ case 'e':
process = true;
break;
default: