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vsprintf: Fix potential unaligned access

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[ Upstream commit d75b26f880f60ead301e79ba0f4a635c5a60767f ]

The %p4cc specifier in some cases might get an unaligned pointer.
Due to this we need to make copy to local variable once to avoid
potential crashes on some architectures due to improper access.

Fixes: af612e43de6d ("lib/vsprintf: Add support for printing V4L2 and DRM fourccs")
Cc: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Signed-off-by: Petr Mladek <pmladek@suse.com>
Link: https://lore.kernel.org/r/20220127181233.72910-1-andriy.shevchenko@linux.intel.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Andy Shevchenko 2022-01-27 20:12:32 +02:00 committed by Greg Kroah-Hartman
parent b4c8675a71
commit 2305e3460b
1 changed files with 7 additions and 5 deletions
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12
lib/vsprintf.c
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@ -49,6 +49,7 @@
#include <asm/page.h> /* for PAGE_SIZE */
#include <asm/byteorder.h> /* cpu_to_le16 */
#include <asm/unaligned.h>
#include <linux/string_helpers.h>
#include "kstrtox.h"
@ -1771,7 +1772,7 @@ char *fourcc_string(char *buf, char *end, const u32 *fourcc,
char output[sizeof("0123 little-endian (0x01234567)")];
char *p = output;
unsigned int i;
u32 val;
u32 orig, val;
if (fmt[1] != 'c' || fmt[2] != 'c')
return error_string(buf, end, "(%p4?)", spec);
@ -1779,21 +1780,22 @@ char *fourcc_string(char *buf, char *end, const u32 *fourcc,
if (check_pointer(&buf, end, fourcc, spec))
return buf;
val = *fourcc & ~BIT(31);
orig = get_unaligned(fourcc);
val = orig & ~BIT(31);
for (i = 0; i < sizeof(*fourcc); i++) {
for (i = 0; i < sizeof(u32); i++) {
unsigned char c = val >> (i * 8);
/* Print non-control ASCII characters as-is, dot otherwise */
*p++ = isascii(c) && isprint(c) ? c : '.';
}
strcpy(p, *fourcc & BIT(31) ? " big-endian" : " little-endian");
strcpy(p, orig & BIT(31) ? " big-endian" : " little-endian");
p += strlen(p);
*p++ = ' ';
*p++ = '(';
p = special_hex_number(p, output + sizeof(output) - 2, *fourcc, sizeof(u32));
p = special_hex_number(p, output + sizeof(output) - 2, orig, sizeof(u32));
*p++ = ')';
*p = '\0';