linux.git/lib/vsprintf.c, branch v7.2-rc1

Merge tag 'printk-for-7.2' of git://git.kernel.org/pub/scm/linux/kernel/git/printk/linux

2026-06-17T19:05:20+00:00

Pull printk updates from Petr Mladek:

 - Add upper case flavor for printing MAC addresses (%p[mM][U]) and use
   it in the nintendo driver

 - Fix matching of hash_pointers= parameter modes

 - Fix size check of vsprintf() field_width and precision values

 - Add check of size returned by vsprintf()

 - Add KUnit test for restricted pointer printing (%pK)

 - Some code cleanup

* tag 'printk-for-7.2' of git://git.kernel.org/pub/scm/linux/kernel/git/printk/linux:
  HID: nintendo: Use %pM format specifier for MAC addresses
  vsprintf: Add upper case flavour to %p[mM]
  lib/vsprintf: replace min_t/max_t with min/max
  printk: fix typos in comments
  lib/vsprintf: Require exact hash_pointers mode matches
  vsprintf: Add test for restricted kernel pointers
  vsprintf: Only export no_hash_pointers to test module
  lib/vsprintf: Limit the returning size to INT_MAX
  lib/vsprintf: Fix to check field_width and precision

Merge branch 'for-7.2-vsprintf-pmM-uppercase' into for-linus

2026-06-17T06:58:22+00:00

Merge branch 'for-7.2-vsprintf-size-checks' into for-linus

2026-06-17T06:58:09+00:00

vsprintf: Add upper case flavour to %p[mM]

2026-06-12T12:20:25+00:00

Some of the (ABI aware) code needs an upper case when printing MAC
addresses. Introduce an extension for that into the existing %p[mM].

Signed-off-by: Andy Shevchenko 
Reviewed-by: Petr Mladek 
Link: https://patch.msgid.link/20260603104351.152085-2-andriy.shevchenko@linux.intel.com
Signed-off-by: Petr Mladek

lib/vsprintf: replace min_t/max_t with min/max

2026-06-03T11:37:42+00:00

Use the simpler min()/max() macros since the values are all compatible.

Signed-off-by: Thorsten Blum 
Link: https://patch.msgid.link/20260518123145.79411-3-thorsten.blum@linux.dev
Signed-off-by: Petr Mladek

lib/vsprintf: Require exact hash_pointers mode matches

2026-05-26T09:06:12+00:00

hash_pointers= accepts a small set of mode strings, but the parser uses
strncmp() with the length of each valid mode.  That accepts values with
trailing garbage, such as hash_pointers=autobots or
hash_pointers=nevermind, as valid aliases for auto and never.

Use strcmp() so that only the documented mode strings are accepted.
Invalid values will continue to fall back to auto through the existing
unknown-mode path.

Signed-off-by: Kaitao Cheng 
Reviewed-by: Petr Mladek 
Link: https://patch.msgid.link/20260519130117.48097-1-kaitao.cheng@linux.dev
Signed-off-by: Petr Mladek

vsprintf: Add test for restricted kernel pointers

2026-05-21T14:04:54+00:00

Fill out the tests for restricted kernel pointers, using the %pK format.

Signed-off-by: Thomas Weißschuh 
Reviewed-by: Petr Mladek 
Tested-by: Petr Mladek 
Link: https://patch.msgid.link/20260504-restricted-pointers-kunit-test-v2-2-19e8b1c0fbeb@linutronix.de
[pmladek@suse.com: Removed questionable ifdeffery.]
Signed-off-by: Petr Mladek

vsprintf: Only export no_hash_pointers to test module

2026-05-21T14:01:52+00:00

Aside from the printf test module, no module should ever use this symbol.

Suggested-by: Petr Mladek 
Link: https://lore.kernel.org/all/aWpwMyFEfpCNN297@pathway.suse.cz/
Suggested-by: Andy Shevchenko 
Link: https://lore.kernel.org/all/aW3em-KplLVofU5z@smile.fi.intel.com/
Signed-off-by: Thomas Weißschuh 
Reviewed-by: Petr Mladek 
Tested-by: Petr Mladek 
Link: https://patch.msgid.link/20260504-restricted-pointers-kunit-test-v2-1-19e8b1c0fbeb@linutronix.de
[pmladek@suse.com: Removed questionable ifdeffery.]
Signed-off-by: Petr Mladek

vsprintf: Revert "add simple_strntoul"

2026-05-21T07:32:46+00:00

No users anymore and none should be in the first place.

This reverts commit fcc155008a20fa31b01569e105250490750f0687.

Signed-off-by: Andy Shevchenko 
Link: https://patch.msgid.link/20260331070519.5974-6-ddiss@suse.de
Acked-by: Petr Mladek 
Reviewed-by: David Disseldorp 
Signed-off-by: Christian Brauner

lib/vsprintf: Limit the returning size to INT_MAX

2026-05-05T08:19:15+00:00

The return value of vsnprintf() and bstr_printf() can overflow INT_MAX
and return a minus value. In the @size is checked input overflow, but
it does not check the output, which is expected required size.

This should never happen but it should be checked and limited.

Signed-off-by: Masami Hiramatsu (Google) 
Reviewed-by: Petr Mladek 
Link: https://patch.msgid.link/177452713020.197965.3164174544083829000.stgit@devnote2
Signed-off-by: Petr Mladek