[PATCH net] netconsole: avoid out-of-bounds access on empty string in trim_newline()

[Breno Leitao <leitao@debian.org>]

trim_newline() unconditionally dereferences s[len - 1] after computing
len = strnlen(s, maxlen). When the string is empty, len is 0 and the
expression underflows to s[(size_t)-1], reading (and potentially
writing) one byte before the buffer.

The two callers feed trim_newline() with the result of strscpy() from
configfs store callbacks (dev_name_store, userdatum_value_store).
configfs guarantees count >= 1 reaches the callback, but the byte
itself can be NUL: a userspace write(fd, "\0", 1) leaves the
destination empty after strscpy() and triggers the underflow. The OOB
write only fires if the adjacent byte happens to be '\n', so this is
not a security issue, but the access is undefined behaviour either way.

This pattern is commonly flagged by LLM-based code reviewers. While it
is not a security fix, the underlying access is undefined behaviour and
the change is small and self-contained, so it is a reasonable candidate
for the stable trees.

Guard the dereference on a non-zero length.

Fixes: ae001dc67907 ("net: netconsole: move newline trimming to function")
Cc: stable@vger.kernel.org
Signed-off-by: Breno Leitao <leitao@debian.org>
---
 drivers/net/netconsole.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/netconsole.c b/drivers/net/netconsole.c
index 3c9acd6e49e86..205384dab89a6 100644
--- a/drivers/net/netconsole.c
+++ b/drivers/net/netconsole.c
@@ -497,6 +497,8 @@ static void trim_newline(char *s, size_t maxlen)
 	size_t len;
 
 	len = strnlen(s, maxlen);
+	if (!len)
+		return;
 	if (s[len - 1] == '\n')
 		s[len - 1] = '\0';
 }

---
base-commit: c7275b05bc428c7373d97aa2da02d3a7fa6b9f66
change-id: 20260420-netcons_trim_newline-36f6ec3b9820

Best regards,
--  
Breno Leitao <leitao@debian.org>