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calls: Fix a memory leak in maybe_warn_rdwr_sizes [PR99004] 

The print_generic_expr_to_str function ends with
return xstrdup (...); and therefore expects the caller to free
the argument.

The following patch does that after it has been copied.
Instead of doing const_cast to cast away const char * to char *,
because the code uses s0 and s1 in so few places, I chose just
to change the types of the two variables so that const_cast
is not needed.  After all, it is a heap allocated string that
this function owns and so if it wanted, it could change it too.

2021-02-09  Jakub Jelinek  <jakub@redhat.com>

	PR middle-end/99004
	* calls.c (maybe_warn_rdwr_sizes): Change s0 and s1 type from
	const char * to char * and free those pointers after use.
This commit is contained in:
Jakub Jelinek 2021-02-09 12:29:32 +01:00
parent 283653f455
commit e5304598f1
1 changed files with 4 additions and 2 deletions
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6
gcc/calls.c
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@ -2032,7 +2032,7 @@ maybe_warn_rdwr_sizes (rdwr_map *rwm, tree fndecl, tree fntype, tree exp)
tree sizrng[2] = { size_zero_node, build_all_ones_cst (sizetype) };
if (get_size_range (access_size, sizrng, true))
{
const char *s0 = print_generic_expr_to_str (sizrng[0]);
char *s0 = print_generic_expr_to_str (sizrng[0]);
if (tree_int_cst_equal (sizrng[0], sizrng[1]))
{
gcc_checking_assert (strlen (s0) < sizeof sizstr);
@ -2040,11 +2040,13 @@ maybe_warn_rdwr_sizes (rdwr_map *rwm, tree fndecl, tree fntype, tree exp)
}
else
{
const char *s1 = print_generic_expr_to_str (sizrng[1]);
char *s1 = print_generic_expr_to_str (sizrng[1]);
gcc_checking_assert (strlen (s0) + strlen (s1)
< sizeof sizstr - 4);
sprintf (sizstr, "[%s, %s]", s0, s1);
free (s1);
}
free (s0);
}
else
*sizstr = '\0';