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HID: picoLCD: bounds check in dump_buff_as_hex()

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Make sure we keep enough space for terminating NUL character after last
newline. If we have too much data, replace last byte with '.'s to
make overflow visible.

Using hex_dump_to_buffer() is not interesting as it adds more overhead
and does not append the trailing linefeed.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Bruno Prémont <bonbons@linux-vserver.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Bruno Prémont 2012-09-19 21:18:10 +02:00 committed by Jiri Kosina
parent 206e3f1cda
commit 5ed84c341c
1 changed files with 6 additions and 6 deletions
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12
drivers/hid/hid-picolcd_debugfs.c
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@ -381,16 +381,16 @@ static void dump_buff_as_hex(char *dst, size_t dst_sz, const u8 *data,
const size_t data_len)
{
int i, j;
for (i = j = 0; i < data_len && j + 3 < dst_sz; i++) {
for (i = j = 0; i < data_len && j + 4 < dst_sz; i++) {
dst[j++] = hex_asc[(data[i] >> 4) & 0x0f];
dst[j++] = hex_asc[data[i] & 0x0f];
dst[j++] = ' ';
}
if (j < dst_sz) {
dst[j--] = '\0';
dst[j] = '\n';
} else
dst[j] = '\0';
dst[j] = '\0';
if (j > 0)
dst[j-1] = '\n';
if (i < data_len && j > 2)
dst[j-2] = dst[j-3] = '.';
}
void picolcd_debug_out_report(struct picolcd_data *data,