error27 / smatch Goto Github PK

#include <stdio.h>
#include <stdbool.h>

int main(void)
{
	int n;

	for (bool done = false; !done; done = true) {
		n = printf("did it!\n");
	}

	return n > 1 ? 0 : 1;
}

~/git/smatch/smatch smatch_switch_repro.c
smatch_switch_repro.c:43 badfunc() error: uninitialized symbol 'my_int'.

// SPDX-License-Identifier: BSD-3-Clause
/*
 * Copyright 2021, Intel Corporation
 *
 * A quick demo of a smatch false positive
 */

#include <stdio.h>

enum three_values
{
        value_one,
        value_two,
        value_three
};

void badfunc(const enum three_values cmd)
{
        unsigned int my_int, new_int; //uninitialized

        switch (cmd) {
        case value_one:
                printf("one\n");
                my_int = 1;
                break;
        case value_two:
                printf("two\n");
                my_int = 2;
                break;
        case value_three:
                printf("three\n");
                my_int = 3;
                break;
        /* no default because all enum values handled, which has value
         * to developers because it forces compile error if not all enum values
         * handled and enum is changed */
        //default:
                //my_int = 4;
                //break;
        }

        new_int = 0;
        new_int |= my_int;

        printf("data: %d\n", new_int);
}

int main(int argc __attribute__((unused)), char **argv __attribute__((unused)))
{
        enum three_values my_enum = value_two;

        badfunc(my_enum);

        return 0;
}

VM_BUG_ON_PGFLAGS(n > 0 && !test_bit(PG_head, &page->flags), page);

  BUILD   arch/x86/boot/bzImage
Kernel: arch/x86/boot/bzImage is ready  (#8)
Done. Build with status 0. The warnings are saved to smatch_warns.txt
smatch_warns.txt built.
Done.  List saved as 'kernel.allocation_funcs'
Done.  List saved as 'kernel.bit_shifters'
Done.  List saved as 'kernel.dma_funcs'
Done.  List saved as 'kernel.returns_err_ptr'
Done.  List saved as 'kernel.expects_err_ptr'
Done.  List saved as 'kernel.frees_argument'
Done.  List saved as 'kernel.gfp_flags'
Done.  List saved as 'kernel.implicit_dependencies
Done.  List saved as 'kernel.no_return_funcs'
Copy it to smatch_data/<project>.no_return_funcs
Done.  List saved as 'kernel.puts_argument'
Done.  List saved as 'kernel.rosenberg_funcs'
Done.  List saved as 'kernel.sizeof_param'
Done.  List saved as 'kernel.unwind_functions'
2147483646
delete
delete
Parse error near line 158: no such column: 
  update return_states set value = "" where function = 'gfs2_ea_find' and return
                     error here ---^
Parse error near line 167: no such column: __write_once_size
  delete from return_states where function = "__write_once_size";
                               error here ---^
Parse error near line 169: no such column: s32min-s32max[$1]
  update return_states set value = "s32min-s32max[$1]" where function = 'atomic_
                     error here ---^
Parse error near line 214: no such column: fixup_kernel.sh
  insert into function_ptr values ("fixup_kernel.sh", "r get_handler()", "ioctl_
                     error here ---^
Parse error near line 215: no such column: fixup_kernel.sh
  insert into function_ptr values ("fixup_kernel.sh", "r get_handler()", "ioctl_
                     error here ---^
Parse error near line 1: no such column: 0-u64max[<=$1]
  update return_states set return = "0-u64max[<=$1]" where return = "0-u64max" a
                      error here ---^
Parse error near line 1: no such column: 1-u64max[==$1][<=$1]
  update return_states set return = "1-u64max[==$1][<=$1]" where return = "1-u64
                      error here ---^
Parse error near line 1: no such column: 40[<=$1]
  update return_states set return = "40[<=$1]" where return = "40" and function 
                      error here ---^
Parse error near line 1: no such column: 0-65536[==$1][<=$1]
  update return_states set return = "0-65536[==$1][<=$1]" where return = "0-6553
                      error here ---^
Parse error near line 1: no such column: 1-4096[==$1][<=$1]
  update return_states set return = "1-4096[==$1][<=$1]" where return = "1-4096[
                      error here ---^
Parse error near line 1: no such column: 0-s32max,18446744071562067968-u64max[==$1][<=$1]
  update return_states set return = "0-s32max,18446744071562067968-u64max[==$1][
                      error here ---^
Parse error near line 1: no such column: 128[<=$1]
  update return_states set return = "128[<=$1]" where return = "128" and functio
                      error here ---^
Parse error near line 1: no such column: 0-u64max[==$1][<=$1]
  update return_states set return = "0-u64max[==$1][<=$1]" where return = "0-u64
                      error here ---^
Parse error near line 1: no such column: 1-4095[==$1][<=$1]
  update return_states set return = "1-4095[==$1][<=$1]" where return = "1-4095[
                      error here ---^
Parse error near line 1: no such column: 80[<=$1]
  update return_states set return = "80[<=$1]" where return = "80" and function 
                      error here ---^
Parse error near line 1: no such column: 305-1073741824[==$1][<=$1]
  update return_states set return = "305-1073741824[==$1][<=$1]" where return = 
                      error here ---^
Parse error near line 1: no such column: 1-u32max[==$1][<=$1]
  update return_states set return = "1-u32max[==$1][<=$1]" where return = "1-u32
                      error here ---^
Parse error near line 1: no such column: 124[<=$1]
  update return_states set return = "124[<=$1]" where return = "124" and functio
                      error here ---^