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| author | Masahiro Yamada <masahiroy@kernel.org> | 2023-11-15 13:16:53 +0900 |
|---|---|---|
| committer | Masahiro Yamada <masahiroy@kernel.org> | 2023-11-17 13:24:08 +0900 |
| commit | ae1eff0349f2e908fc083630e8441ea6dc434dc0 (patch) | |
| tree | eaecd0aa59fa4c44633232c88b59f408804653cb | |
| parent | 76020731d4ee897411ce4a73916ed805ea15d946 (diff) | |
| download | linux-stable-ae1eff0349f2e908fc083630e8441ea6dc434dc0.tar.gz linux-stable-ae1eff0349f2e908fc083630e8441ea6dc434dc0.tar.bz2 linux-stable-ae1eff0349f2e908fc083630e8441ea6dc434dc0.zip | |
kconfig: fix memory leak from range properties
Currently, sym_validate_range() duplicates the range string using
xstrdup(), which is overwritten by a subsequent sym_calc_value() call.
It results in a memory leak.
Instead, only the pointer should be copied.
Below is a test case, with a summary from Valgrind.
[Test Kconfig]
config FOO
int "foo"
range 10 20
[Test .config]
CONFIG_FOO=0
[Before]
LEAK SUMMARY:
definitely lost: 3 bytes in 1 blocks
indirectly lost: 0 bytes in 0 blocks
possibly lost: 0 bytes in 0 blocks
still reachable: 17,465 bytes in 21 blocks
suppressed: 0 bytes in 0 blocks
[After]
LEAK SUMMARY:
definitely lost: 0 bytes in 0 blocks
indirectly lost: 0 bytes in 0 blocks
possibly lost: 0 bytes in 0 blocks
still reachable: 17,462 bytes in 20 blocks
suppressed: 0 bytes in 0 blocks
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
| -rw-r--r-- | scripts/kconfig/symbol.c | 14 |
1 files changed, 6 insertions, 8 deletions
diff --git a/scripts/kconfig/symbol.c b/scripts/kconfig/symbol.c index 0572330bf8a7..a76925b46ce6 100644 --- a/scripts/kconfig/symbol.c +++ b/scripts/kconfig/symbol.c @@ -122,9 +122,9 @@ static long long sym_get_range_val(struct symbol *sym, int base) static void sym_validate_range(struct symbol *sym) { struct property *prop; + struct symbol *range_sym; int base; long long val, val2; - char str[64]; switch (sym->type) { case S_INT: @@ -140,17 +140,15 @@ static void sym_validate_range(struct symbol *sym) if (!prop) return; val = strtoll(sym->curr.val, NULL, base); - val2 = sym_get_range_val(prop->expr->left.sym, base); + range_sym = prop->expr->left.sym; + val2 = sym_get_range_val(range_sym, base); if (val >= val2) { - val2 = sym_get_range_val(prop->expr->right.sym, base); + range_sym = prop->expr->right.sym; + val2 = sym_get_range_val(range_sym, base); if (val <= val2) return; } - if (sym->type == S_INT) - sprintf(str, "%lld", val2); - else - sprintf(str, "0x%llx", val2); - sym->curr.val = xstrdup(str); + sym->curr.val = range_sym->curr.val; } static void sym_set_changed(struct symbol *sym) |