[PATCH v2 1/8] unicode: Fix utf8_load() error path

["André Almeida" <andrealmeid@igalia.com>]

utf8_load() requests the symbol "utf8_data_table" and then checks if the
requested UTF-8 version is supported. If it's unsupported, it tries to
put the data table using symbol_put(). If an unsupported version is
requested, symbol_put() fails like this:

 kernel BUG at kernel/module/main.c:786!
 RIP: 0010:__symbol_put+0x93/0xb0
 Call Trace:
  <TASK>
  ? __die_body.cold+0x19/0x27
  ? die+0x2e/0x50
  ? do_trap+0xca/0x110
  ? do_error_trap+0x65/0x80
  ? __symbol_put+0x93/0xb0
  ? exc_invalid_op+0x51/0x70
  ? __symbol_put+0x93/0xb0
  ? asm_exc_invalid_op+0x1a/0x20
  ? __pfx_cmp_name+0x10/0x10
  ? __symbol_put+0x93/0xb0
  ? __symbol_put+0x62/0xb0
  utf8_load+0xf8/0x150

That happens because symbol_put() expects the unique string that
identify the symbol, instead of a pointer to the loaded symbol. Fix that
by using such string.

Fixes: 2b3d04787012 ("unicode: Add utf8-data module")
Signed-off-by: André Almeida <andrealmeid@igalia.com>
---
 fs/unicode/utf8-core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/unicode/utf8-core.c b/fs/unicode/utf8-core.c
index 8395066341a4..0400824ef493 100644
--- a/fs/unicode/utf8-core.c
+++ b/fs/unicode/utf8-core.c
@@ -198,7 +198,7 @@ struct unicode_map *utf8_load(unsigned int version)
 	return um;
 
 out_symbol_put:
-	symbol_put(um->tables);
+	symbol_put(utf8_data_table);
 out_free_um:
 	kfree(um);
 	return ERR_PTR(-EINVAL);
-- 
2.46.0