Re: [PATCH linux-next v2] parisc: use strscpy() to instead of strncpy()

From: Helge Deller
Date: Tue Dec 27 2022 - 16:33:14 EST


On 12/27/22 08:47, Rolf Eike Beer wrote:
Am Montag, 26. Dezember 2022, 11:40:04 CET schrieb yang.yang29@xxxxxxxxxx:
From: Xu Panda <xu.panda@xxxxxxxxxx>

The implementation of strscpy() is more robust and safer.
That's now the recommended way to copy NUL-terminated strings.

Signed-off-by: Xu Panda <xu.panda@xxxxxxxxxx>
Signed-off-by: Yang Yang <yang.yang29@xxxxxxx>
---
change for v2
- sizeof(in) is better and simplified, thanks for Helge Deller.
---
drivers/parisc/pdc_stable.c | 9 +++------
1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/drivers/parisc/pdc_stable.c b/drivers/parisc/pdc_stable.c
index d6af5726ddf3..d3075445260b 100644
--- a/drivers/parisc/pdc_stable.c
+++ b/drivers/parisc/pdc_stable.c
@@ -274,8 +274,7 @@ pdcspath_hwpath_write(struct pdcspath_entry *entry,
const char *buf, size_t coun

/* We'll use a local copy of buf */
count = min_t(size_t, count, sizeof(in)-1);
- strncpy(in, buf, count);
- in[count] = '\0';
+ strscpy(in, buf, sizeof(in));

What is "count" now needed for? Looks like a write only variable at least in
these hunks.

isn't count the return value?

Helge