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| author | Andy Shevchenko <andriy.shevchenko@linux.intel.com> | 2025-11-10 16:21:18 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2026-01-19 15:11:31 +0300 |
| commit | a9af8ca089927de78da3bc8ea71f46b78c8731fa (patch) | |
| tree | 7e9f65e4ac7d9e6eca785d505429a6f508448c0e /lib | |
| parent | 80ff15286f1c472071b8ab6670b2e724873584d7 (diff) | |
| download | linux-a9af8ca089927de78da3bc8ea71f46b78c8731fa.tar.xz | |
lib/vsprintf: Check pointer before dereferencing in time_and_date()
[ Upstream commit 372a12bd5df0199aa234eaf8ef31ed7ecd61d40f ]
The pointer may be invalid when gets to the printf(). In particular
the time_and_date() dereferencing it in some cases without checking.
Move the check from rtc_str() to time_and_date() to cover all cases.
Fixes: 7daac5b2fdf8 ("lib/vsprintf: Print time64_t in human readable format")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Link: https://patch.msgid.link/20251110132118.4113976-1-andriy.shevchenko@linux.intel.com
Signed-off-by: Petr Mladek <pmladek@suse.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/vsprintf.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/lib/vsprintf.c b/lib/vsprintf.c index 90372391ce90..b643012ae47f 100644 --- a/lib/vsprintf.c +++ b/lib/vsprintf.c @@ -1829,9 +1829,6 @@ char *rtc_str(char *buf, char *end, const struct rtc_time *tm, bool raw = false; int count = 2; - if (check_pointer(&buf, end, tm, spec)) - return buf; - switch (fmt[count]) { case 'd': have_t = false; @@ -1886,6 +1883,9 @@ static noinline_for_stack char *time_and_date(char *buf, char *end, void *ptr, struct printf_spec spec, const char *fmt) { + if (check_pointer(&buf, end, ptr, spec)) + return buf; + switch (fmt[1]) { case 'R': return rtc_str(buf, end, (const struct rtc_time *)ptr, spec, fmt); |