| Message ID | 20240902225511.757831-2-andrealmeid@igalia.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | tmpfs: Add case-insesitive support for tmpfs | expand |
On Mon, Sep 02, 2024 at 07:55:03PM -0300, André Almeida wrote: > 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> Nice catch! Reviewed-by: Theodore Ts'o <tytso@mit.edu>
André Almeida <andrealmeid@igalia.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.
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);
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(-)