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jffs2: Fix list_del corruption if compressors initialized failed

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There is a list_del corruption when remove the jffs2 module:

  list_del corruption, ffffffffa0623e60->next is NULL
  WARNING: CPU: 6 PID: 6332 at lib/list_debug.c:49 __list_del_entry_valid+0x98/0x130
  Modules linked in: jffs2(-) ]
  CPU: 6 PID: 6332 Comm: rmmod Tainted: G        W          6.1.0-rc2+ #5
  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-1.fc33 04/01/2014
  RIP: 0010:__list_del_entry_valid+0x98/0x130
  ...
  Call Trace:
   <TASK>
   jffs2_unregister_compressor+0x3e/0xe0 [jffs2]
   jffs2_zlib_exit+0x11/0x30 [jffs2]
   jffs2_compressors_exit+0x1e/0x30 [jffs2]
   exit_jffs2_fs+0x16/0x44f [jffs2]
   __do_sys_delete_module.constprop.0+0x244/0x370
   do_syscall_64+0x35/0x80
   entry_SYSCALL_64_after_hwframe+0x46/0xb0

If one of the compressor initialize failed, the module always insert
success since jffs2_compressors_init() always return success, then
something bad may happen during remove the module.

For this scenario, let's insmod failed.

Signed-off-by: Zhang Xiaoxu <zhangxiaoxu5@huawei.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
This commit is contained in:
Zhang Xiaoxu 2022-10-27 20:49:06 +08:00 committed by Richard Weinberger
parent d5711ae52d
commit 3432e57493
1 changed files with 28 additions and 5 deletions
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33
fs/jffs2/compr.c
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@ -364,12 +364,24 @@ void jffs2_free_comprbuf(unsigned char *comprbuf, unsigned char *orig)
int __init jffs2_compressors_init(void)
{
int ret = 0;
/* Registering compressors */
jffs2_zlib_init();
jffs2_rtime_init();
jffs2_rubinmips_init();
jffs2_dynrubin_init();
jffs2_lzo_init();
ret = jffs2_zlib_init();
if (ret)
goto exit;
ret = jffs2_rtime_init();
if (ret)
goto exit_zlib;
ret = jffs2_rubinmips_init();
if (ret)
goto exit_rtime;
ret = jffs2_dynrubin_init();
if (ret)
goto exit_runinmips;
ret = jffs2_lzo_init();
if (ret)
goto exit_dynrubin;
/* Setting default compression mode */
#ifdef CONFIG_JFFS2_CMODE_NONE
@ -389,6 +401,17 @@ int __init jffs2_compressors_init(void)
#endif
#endif
return 0;
exit_dynrubin:
jffs2_dynrubin_exit();
exit_runinmips:
jffs2_rubinmips_exit();
exit_rtime:
jffs2_rtime_exit();
exit_zlib:
jffs2_zlib_exit();
exit:
return ret;
}
int jffs2_compressors_exit(void)