On Fri, 23 Apr 2021 11:45:29 +0200 Rasmus Villemoes linux@rasmusvillemoes.dk wrote:
Commit 9af7706492f9 ("lib/vsprintf: Remove support for %pF and %pf in favour of %pS and %ps") removed support for %pF and %pf, and correctly removed the handling of those cases in vbin_printf(). However, the corresponding cases in bstr_printf() were left behind.
In the same series, %pf was re-purposed for dealing with fwnodes (3bd32d6a2ee6, "lib/vsprintf: Add %pfw conversion specifier for printing fwnode names").
So should anyone use %pf with the binary printf routines, vbin_printf() would (correctly, as it involves dereferencing the pointer) do the string formatting to the u32 array, but bstr_printf() would not copy the string from the u32 array, but instead interpret the first sizeof(void*) bytes of the formatted string as a pointer - which generally won't end well (also, all subsequent get_args would be out of sync).
Fixes: 9af7706492f9 ("lib/vsprintf: Remove support for %pF and %pf in favour of %pS and %ps") Cc: stable@vger.kernel.org Signed-off-by: Rasmus Villemoes linux@rasmusvillemoes.dk
Reviewed-by: Steven Rostedt (VMware) rostedt@goodmis.org
Thanks!
-- Steve
lib/vsprintf.c | 2 -- 1 file changed, 2 deletions(-)
diff --git a/lib/vsprintf.c b/lib/vsprintf.c index 41ddc353ebb8..39ef2e314da5 100644 --- a/lib/vsprintf.c +++ b/lib/vsprintf.c @@ -3135,8 +3135,6 @@ int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf) switch (*fmt) { case 'S': case 's':
case 'F':case 'f': case 'x': case 'K': case 'e':