From: Rasmus Villemoes linux@rasmusvillemoes.dk
commit 84696cfaf4d90945eb2a8302edc6cf627db56b84 upstream.
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: Sakari Ailus sakari.ailus@linux.intel.com Signed-off-by: Petr Mladek pmladek@suse.com Link: https://lore.kernel.org/r/20210423094529.1862521-1-linux@rasmusvillemoes.dk Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- lib/vsprintf.c | 2 -- 1 file changed, 2 deletions(-)
--- a/lib/vsprintf.c +++ b/lib/vsprintf.c @@ -3102,8 +3102,6 @@ int bstr_printf(char *buf, size_t size, switch (*fmt) { case 'S': case 's': - case 'F': - case 'f': case 'x': case 'K': case 'e':