* [PATCH 1/1] fs: fat_write: fix short name creation.
@ 2020-05-26 19:06 Heinrich Schuchardt
2020-05-31 14:08 ` Simon Glass
2020-07-08 3:03 ` Tom Rini
0 siblings, 2 replies; 3+ messages in thread
From: Heinrich Schuchardt @ 2020-05-26 19:06 UTC (permalink / raw)
To: u-boot
Truncate file names if the buffer size is exceeded to avoid a buffer
overflow.
Use Sphinx style function description.
Add a TODO comment.
Reported-by: CID 303779
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
---
fs/fat/fat_write.c | 15 ++++++++++++---
1 file changed, 12 insertions(+), 3 deletions(-)
diff --git a/fs/fat/fat_write.c b/fs/fat/fat_write.c
index 59cc0bae94..b16a39d3ff 100644
--- a/fs/fat/fat_write.c
+++ b/fs/fat/fat_write.c
@@ -50,8 +50,11 @@ static int disk_write(__u32 block, __u32 nr_blocks, void *buf)
return ret;
}
-/*
- * Set short name in directory entry
+/**
+ * set_name() - set short name in directory entry
+ *
+ * @dirent: directory entry
+ * @filename: long file name
*/
static void set_name(dir_entry *dirent, const char *filename)
{
@@ -66,7 +69,8 @@ static void set_name(dir_entry *dirent, const char *filename)
if (len == 0)
return;
- strcpy(s_name, filename);
+ strncpy(s_name, filename, VFAT_MAXLEN_BYTES - 1);
+ s_name[VFAT_MAXLEN_BYTES - 1] = '\0';
uppercase(s_name, len);
period = strchr(s_name, '.');
@@ -87,6 +91,11 @@ static void set_name(dir_entry *dirent, const char *filename)
memcpy(dirent->name, s_name, period_location);
} else {
memcpy(dirent->name, s_name, 6);
+ /*
+ * TODO: Translating two long names with the same first six
+ * characters to the same short name is utterly wrong.
+ * Short names must be unique.
+ */
dirent->name[6] = '~';
dirent->name[7] = '1';
}
--
2.26.2
^ permalink raw reply related [flat|nested] 3+ messages in thread
* [PATCH 1/1] fs: fat_write: fix short name creation.
2020-05-26 19:06 [PATCH 1/1] fs: fat_write: fix short name creation Heinrich Schuchardt
@ 2020-05-31 14:08 ` Simon Glass
2020-07-08 3:03 ` Tom Rini
1 sibling, 0 replies; 3+ messages in thread
From: Simon Glass @ 2020-05-31 14:08 UTC (permalink / raw)
To: u-boot
Hi Heinrich,
On Tue, 26 May 2020 at 13:12, Heinrich Schuchardt <xypron.glpk@gmx.de> wrote:
>
> Truncate file names if the buffer size is exceeded to avoid a buffer
> overflow.
>
> Use Sphinx style function description.
>
> Add a TODO comment.
>
> Reported-by: CID 303779
> Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
> ---
> fs/fat/fat_write.c | 15 ++++++++++++---
> 1 file changed, 12 insertions(+), 3 deletions(-)
Reviewed-by: Simon Glass <sjg@chromium.org>
See below
>
> diff --git a/fs/fat/fat_write.c b/fs/fat/fat_write.c
> index 59cc0bae94..b16a39d3ff 100644
> --- a/fs/fat/fat_write.c
> +++ b/fs/fat/fat_write.c
> @@ -50,8 +50,11 @@ static int disk_write(__u32 block, __u32 nr_blocks, void *buf)
> return ret;
> }
>
> -/*
> - * Set short name in directory entry
> +/**
> + * set_name() - set short name in directory entry
> + *
> + * @dirent: directory entry
> + * @filename: long file name
> */
> static void set_name(dir_entry *dirent, const char *filename)
> {
> @@ -66,7 +69,8 @@ static void set_name(dir_entry *dirent, const char *filename)
> if (len == 0)
> return;
>
> - strcpy(s_name, filename);
> + strncpy(s_name, filename, VFAT_MAXLEN_BYTES - 1);
> + s_name[VFAT_MAXLEN_BYTES - 1] = '\0';
Could use strlcpy() here
> uppercase(s_name, len);
>
> period = strchr(s_name, '.');
> @@ -87,6 +91,11 @@ static void set_name(dir_entry *dirent, const char *filename)
> memcpy(dirent->name, s_name, period_location);
> } else {
> memcpy(dirent->name, s_name, 6);
> + /*
> + * TODO: Translating two long names with the same first six
> + * characters to the same short name is utterly wrong.
> + * Short names must be unique.
> + */
> dirent->name[6] = '~';
> dirent->name[7] = '1';
> }
> --
> 2.26.2
>
Regards,
Simon
^ permalink raw reply [flat|nested] 3+ messages in thread
* [PATCH 1/1] fs: fat_write: fix short name creation.
2020-05-26 19:06 [PATCH 1/1] fs: fat_write: fix short name creation Heinrich Schuchardt
2020-05-31 14:08 ` Simon Glass
@ 2020-07-08 3:03 ` Tom Rini
1 sibling, 0 replies; 3+ messages in thread
From: Tom Rini @ 2020-07-08 3:03 UTC (permalink / raw)
To: u-boot
On Tue, May 26, 2020 at 09:06:50PM +0200, Heinrich Schuchardt wrote:
> Truncate file names if the buffer size is exceeded to avoid a buffer
> overflow.
>
> Use Sphinx style function description.
>
> Add a TODO comment.
>
> Reported-by: CID 303779
> Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
> Reviewed-by: Simon Glass <sjg@chromium.org>
Applied to u-boot/master, thanks!
--
Tom
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2020-05-26 19:06 [PATCH 1/1] fs: fat_write: fix short name creation Heinrich Schuchardt
2020-05-31 14:08 ` Simon Glass
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