From: Dean Anderson <dean@sensoray.com>
To: linux-usb@vger.kernel.org, balbi@kernel.org
Cc: Dean Anderson <dean@sensoray.com>,
Linux Media Mailing List <linux-media@vger.kernel.org>
Subject: [PATCH] usb: gadget/function/f_fs string table fix for multiple languages
Date: Wed, 17 Mar 2021 15:41:09 -0700 [thread overview]
Message-ID: <20210317224109.21534-1-dean@sensoray.com> (raw)
Fixes bug with the handling of more than one language in
the string table in f_fs.c.
str_count was not reset for subsequent language codes.
str_count-- "rolls under" and processes u32 max strings on
the processing of the second language entry.
The existing bug can be reproduced by adding a second language table
to the structure "strings" in tools/usb/ffs-test.c.
Signed-off-by: Dean Anderson <dean@sensoray.com>
---
drivers/usb/gadget/function/f_fs.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/gadget/function/f_fs.c b/drivers/usb/gadget/function/f_fs.c
index 801a8b668..10a5d9f0f 100644
--- a/drivers/usb/gadget/function/f_fs.c
+++ b/drivers/usb/gadget/function/f_fs.c
@@ -2640,6 +2640,7 @@ static int __ffs_data_got_strings(struct ffs_data *ffs,
do { /* lang_count > 0 so we can use do-while */
unsigned needed = needed_count;
+ u32 str_per_lang = str_count;
if (len < 3)
goto error_free;
@@ -2675,7 +2676,7 @@ static int __ffs_data_got_strings(struct ffs_data *ffs,
data += length + 1;
len -= length + 1;
- } while (--str_count);
+ } while (--str_per_lang);
s->id = 0; /* terminator */
s->s = NULL;
--
2.17.1
reply other threads:[~2021-03-17 23:04 UTC|newest]
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