linux-kernel - Re: [PATCH v2 1/8] unicode: Fix utf8

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Message-ID: <87wmjsfztv.fsf@mailhost.krisman.be>
Date: Tue, 03 Sep 2024 12:48:28 -0400
From: Gabriel Krisman Bertazi <krisman@...e.de>
To: André Almeida <andrealmeid@...lia.com>
Cc: Hugh Dickins <hughd@...gle.com>,  Andrew Morton
 <akpm@...ux-foundation.org>,  Alexander Viro <viro@...iv.linux.org.uk>,
  Christian Brauner <brauner@...nel.org>,  Jan Kara <jack@...e.cz>,
  krisman@...nel.org,  linux-mm@...ck.org,  linux-kernel@...r.kernel.org,
  linux-fsdevel@...r.kernel.org,  kernel-dev@...lia.com,  Daniel Rosenberg
 <drosen@...gle.com>,  smcv@...labora.com,  Christoph Hellwig <hch@....de>
Subject: Re: [PATCH v2 1/8] unicode: Fix utf8_load() error path

André Almeida <andrealmeid@...lia.com> writes:

> 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.
>

Thanks!

I picked only this one via the for-next branch of the unicode tree.  No need to resubmit
this one with the rest of the series.

-- 
Gabriel Krisman Bertazi