linux-kernel - [PATCH 2/5] coredump: Fix handling of partial writes in dump

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Date:   Tue, 28 Apr 2020 05:27:42 +0200
From:   Jann Horn <jannh@...gle.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Christoph Hellwig <hch@....de>, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, linux-fsdevel@...r.kernel.org,
        Alexander Viro <viro@...iv.linux.org.uk>,
        "Eric W . Biederman" <ebiederm@...ssion.com>,
        Oleg Nesterov <oleg@...hat.com>,
        Russell King <linux@...linux.org.uk>,
        linux-arm-kernel@...ts.infradead.org,
        Mark Salter <msalter@...hat.com>,
        Aurelien Jacquiot <jacquiot.aurelien@...il.com>,
        linux-c6x-dev@...ux-c6x.org,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>, linux-sh@...r.kernel.org
Subject: [PATCH 2/5] coredump: Fix handling of partial writes in dump_emit()

After a partial write, we have to update the input buffer pointer.

Fixes: 2507a4fbd48a ("make dump_emit() use vfs_write() instead of banging at ->f_op->write directly")
Cc: stable@...r.kernel.org
Signed-off-by: Jann Horn <jannh@...gle.com>
---
 fs/coredump.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/coredump.c b/fs/coredump.c
index 408418e6aa131..047f5a11dbee7 100644
--- a/fs/coredump.c
+++ b/fs/coredump.c
@@ -833,6 +833,7 @@ int dump_emit(struct coredump_params *cprm, const void *addr, int nr)
 		cprm->written += n;
 		cprm->pos += n;
 		nr -= n;
+		addr += n;
 	}
 	return 1;
 }
-- 
2.26.2.303.gf8c07b1a785-goog