linux-kernel - [PATCH] fix page leak during core dump

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Message-ID: <20070329203913.GA5190@skull.piratehaven.org>
Date:	Thu, 29 Mar 2007 13:39:13 -0700
From:	Brian Pomerantz <bapper@...atehaven.org>
To:	viro@...iv.linux.org.uk
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH] fix page leak during core dump


When the dump cannot occur most likely because of a full file system
and the page to be written is the zero page, the call to
page_cache_release() is missed.

Signed-off-by: Brian Pomerantz <bapper@...sta.com>

diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c
index a2fceba..9cc4f0a 100644
--- a/fs/binfmt_elf.c
+++ b/fs/binfmt_elf.c
@@ -1704,7 +1704,10 @@ static int elf_core_dump(long signr, struct pt_regs *regs, struct file *file)
 				DUMP_SEEK(PAGE_SIZE);
 			} else {
 				if (page == ZERO_PAGE(addr)) {
-					DUMP_SEEK(PAGE_SIZE);
+					if (!dump_seek(file, PAGE_SIZE)) {
+						page_cache_release(page);
+						goto end_coredump;
+					}
 				} else {
 					void *kaddr;
 					flush_cache_page(vma, addr,
-
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