linux-kernel - kernel/trace/trace_events_user.c:392:38: sparse: sparse: Using plain integer as NULL pointer

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Message-ID: <202203281754.okRdoDAL-lkp@intel.com>
Date:   Mon, 28 Mar 2022 17:22:06 +0800
From:   kernel test robot <lkp@...el.com>
To:     Beau Belgrave <beaub@...ux.microsoft.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        "Steven Rostedt (Google)" <rostedt@...dmis.org>
Subject: kernel/trace/trace_events_user.c:392:38: sparse: sparse: Using plain
 integer as NULL pointer

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   ae085d7f9365de7da27ab5c0d16b12d51ea7fca9
commit: aa3b2b4c669205200615dd8a2cc4af4f81fd0335 user_events: Add print_fmt generation support for basic types
date:   6 weeks ago
config: i386-randconfig-s001-20220328 (https://download.01.org/0day-ci/archive/20220328/202203281754.okRdoDAL-lkp@intel.com/config)
compiler: gcc-9 (Ubuntu 9.4.0-1ubuntu1~20.04.1) 9.4.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.4-dirty
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=aa3b2b4c669205200615dd8a2cc4af4f81fd0335
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout aa3b2b4c669205200615dd8a2cc4af4f81fd0335
        # save the config file to linux build tree
        mkdir build_dir
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=i386 SHELL=/bin/bash drivers/acpi/apei/ drivers/gpu/drm/ kernel/trace/

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>


sparse warnings: (new ones prefixed by >>)
>> kernel/trace/trace_events_user.c:392:38: sparse: sparse: Using plain integer as NULL pointer
   kernel/trace/trace_events_user.c:413:40: sparse: sparse: Using plain integer as NULL pointer
   kernel/trace/trace_events_user.c:858:16: sparse: sparse: incompatible types in comparison expression (different address spaces):
   kernel/trace/trace_events_user.c:858:16: sparse:    void [noderef] __rcu *
   kernel/trace/trace_events_user.c:858:16: sparse:    void *
   kernel/trace/trace_events_user.c:922:13: sparse: sparse: cast removes address space '__user' of expression
   kernel/trace/trace_events_user.c:922:13: sparse: sparse: incorrect type in argument 2 (different address spaces) @@     expected void [noderef] __user *buf @@     got char * @@
   kernel/trace/trace_events_user.c:922:13: sparse:     expected void [noderef] __user *buf
   kernel/trace/trace_events_user.c:922:13: sparse:     got char *
   kernel/trace/trace_events_user.c:938:16: sparse: sparse: incompatible types in comparison expression (different address spaces):
   kernel/trace/trace_events_user.c:938:16: sparse:    void [noderef] __rcu *
   kernel/trace/trace_events_user.c:938:16: sparse:    void *
   kernel/trace/trace_events_user.c:965:9: sparse: sparse: incompatible types in comparison expression (different address spaces):
   kernel/trace/trace_events_user.c:965:9: sparse:    void [noderef] __rcu *
   kernel/trace/trace_events_user.c:965:9: sparse:    void *

vim +392 kernel/trace/trace_events_user.c

   361	
   362	static const char *user_field_format(const char *type)
   363	{
   364		if (strcmp(type, "s64") == 0)
   365			return "%lld";
   366		if (strcmp(type, "u64") == 0)
   367			return "%llu";
   368		if (strcmp(type, "s32") == 0)
   369			return "%d";
   370		if (strcmp(type, "u32") == 0)
   371			return "%u";
   372		if (strcmp(type, "int") == 0)
   373			return "%d";
   374		if (strcmp(type, "unsigned int") == 0)
   375			return "%u";
   376		if (strcmp(type, "s16") == 0)
   377			return "%d";
   378		if (strcmp(type, "u16") == 0)
   379			return "%u";
   380		if (strcmp(type, "short") == 0)
   381			return "%d";
   382		if (strcmp(type, "unsigned short") == 0)
   383			return "%u";
   384		if (strcmp(type, "s8") == 0)
   385			return "%d";
   386		if (strcmp(type, "u8") == 0)
   387			return "%u";
   388		if (strcmp(type, "char") == 0)
   389			return "%d";
   390		if (strcmp(type, "unsigned char") == 0)
   391			return "%u";
 > 392		if (strstr(type, "char[") != 0)
   393			return "%s";
   394	
   395		/* Unknown, likely struct, allowed treat as 64-bit */
   396		return "%llu";
   397	}
   398	

-- 
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