git: cd1180d273a8 - stable/15 - LinuxKPI: Clear the sbuf at the start of each call to seq_read

The branch stable/15 has been updated by jhb:

URL: https://cgit.FreeBSD.org/src/commit/?id=cd1180d273a88afb43dda9f27cca389e5d68d905

commit cd1180d273a88afb43dda9f27cca389e5d68d905
Author:     John Baldwin <jhb@FreeBSD.org>
AuthorDate: 2026-03-17 16:05:17 +0000
Commit:     John Baldwin <jhb@FreeBSD.org>
CommitDate: 2026-04-24 17:49:14 +0000

    LinuxKPI: Clear the sbuf at the start of each call to seq_read
    
    Each invocation of seq_read invokes the seq_file.show callback which
    writes into the sbuf.  Then it invokes sbuf_finish before copying the
    data into the caller's buffer.  Without this, a second call to
    seq_read on the same file would try to append data to a finished sbuf.
    
    Reviewed by:    bz
    Sponsored by:   AFRL, DARPA
    
    (cherry picked from commit c181c8f5ca707962359e636ca5aa536e60147eee)
---
 sys/compat/linuxkpi/common/src/linux_seq_file.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/sys/compat/linuxkpi/common/src/linux_seq_file.c b/sys/compat/linuxkpi/common/src/linux_seq_file.c
index 9c06fe27bebe..6fe6ccd1e68e 100644
--- a/sys/compat/linuxkpi/common/src/linux_seq_file.c
+++ b/sys/compat/linuxkpi/common/src/linux_seq_file.c
@@ -49,6 +49,7 @@ seq_read(struct linux_file *f, char *ubuf, size_t size, off_t *ppos)
 
 	m = f->private_data;
 	sbuf = m->buf;
+	sbuf_clear(sbuf);
 
 	p = m->op->start(m, ppos);
 	rc = m->op->show(m, p);