diff options
| author | Arvind Sankar <nivedita@alum.mit.edu> | 2020-05-18 15:07:05 -0400 |
|---|---|---|
| committer | Ard Biesheuvel <ardb@kernel.org> | 2020-05-19 10:31:50 +0200 |
| commit | fb031937a86874e6d663542bdbd83e310c13610e (patch) | |
| tree | 99c883ef67c70364f3234b95cf9f5ac2da168198 /drivers/firmware/efi/libstub | |
| parent | dec6119952eab7257624de5bd116a9e301ead5b7 (diff) | |
efi/printf: Handle null string input
Print "(null)" for 's' if the input is a NULL pointer.
Signed-off-by: Arvind Sankar <nivedita@alum.mit.edu>
Link: https://lore.kernel.org/r/20200518190716.751506-14-nivedita@alum.mit.edu
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Diffstat (limited to 'drivers/firmware/efi/libstub')
| -rw-r--r-- | drivers/firmware/efi/libstub/vsprintf.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/firmware/efi/libstub/vsprintf.c b/drivers/firmware/efi/libstub/vsprintf.c index 27685c726c64..d427a7b1ef64 100644 --- a/drivers/firmware/efi/libstub/vsprintf.c +++ b/drivers/firmware/efi/libstub/vsprintf.c @@ -14,6 +14,7 @@ #include <linux/compiler.h> #include <linux/ctype.h> +#include <linux/limits.h> #include <linux/string.h> static int skip_atoi(const char **s) @@ -356,7 +357,11 @@ int vsprintf(char *buf, const char *fmt, va_list ap) continue; case 's': + if (precision < 0) + precision = INT_MAX; s = va_arg(args, char *); + if (!s) + s = precision < 6 ? "" : "(null)"; len = strnlen(s, precision); if (!(flags & LEFT)) |