[PATCH][next] wlcore: Fix buffer overrun by snprintf due to incorrect buffer size Content-Type: text/plain; charset="utf-8"

[PATCH][next] wlcore: Fix buffer overrun by snprintf due to incorrect buffer size Content-Type: text/plain; charset="utf-8"

[Colin King]

From: Colin Ian King <colin.king@canonical.com>

The size of the buffer than can be written to is currently incorrect, it is
always the size of the entire buffer even though the snprintf is writing
as position pos into the buffer. Fix this by setting the buffer size to be
the number of bytes left in the buffer, namely sizeof(buf) - pos.

Addresses-Coverity: ("Out-of-bounds access")
Fixes: 7b0e2c4f6be3 ("wlcore: fix overlapping snprintf arguments in debugfs")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
---
 drivers/net/wireless/ti/wlcore/debugfs.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wireless/ti/wlcore/debugfs.h b/drivers/net/wireless/ti/wlcore/debugfs.h
index 715edfa5f89f..a9e13e6d65c5 100644
--- a/drivers/net/wireless/ti/wlcore/debugfs.h
+++ b/drivers/net/wireless/ti/wlcore/debugfs.h
@@ -84,7 +84,7 @@ static ssize_t sub## _ ##name## _read(struct file *file,		\
 	wl1271_debugfs_update_stats(wl);				\
 									\
 	for (i = 0; i < len && pos < sizeof(buf); i++)			\
-		pos += snprintf(buf + pos, sizeof(buf),			\
+		pos += snprintf(buf + pos, sizeof(buf) - pos,		\
 			 "[%d] = %d\n", i, stats->sub.name[i]);		\
 									\
 	return wl1271_format_buffer(userbuf, count, ppos, "%s", buf);	\
-- 
2.30.2

Re: [PATCH][next] wlcore: Fix buffer overrun by snprintf due to incorrect buffer size Content-Type: text/plain; charset="utf-8"

[Arnd Bergmann]

On Mon, Apr 19, 2021 at 4:01 PM Colin King <colin.king@canonical.com> wrote:
>
> From: Colin Ian King <colin.king@canonical.com>
>
> The size of the buffer than can be written to is currently incorrect, it is
> always the size of the entire buffer even though the snprintf is writing
> as position pos into the buffer. Fix this by setting the buffer size to be
> the number of bytes left in the buffer, namely sizeof(buf) - pos.
>
> Addresses-Coverity: ("Out-of-bounds access")
> Fixes: 7b0e2c4f6be3 ("wlcore: fix overlapping snprintf arguments in debugfs")
> Signed-off-by: Colin Ian King <colin.king@canonical.com>

Acked-by: Arnd Bergmann <arnd@arndb.de>