linux-kernel - [PATCH v1 1/4] mm: deduplicate error handling for map_deny_write

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Date:   Wed, 8 Mar 2023 19:04:20 +0000
From:   Joey Gouly <joey.gouly@....com>
To:     Andrew Morton <akpm@...ux-foundation.org>
CC:     <nd@....com>, <acme@...hat.com>, <catalin.marinas@....com>,
        <izbyshev@...ras.ru>, <joey.gouly@....com>, <peterx@...hat.com>,
        <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
        Shuah Khan <shuah@...nel.org>,
        Kees Cook <keescook@...omium.org>
Subject: [PATCH v1 1/4] mm: deduplicate error handling for map_deny_write_exec

Commit cc8d1b097de7 ("mmap: clean up mmap_region() unrolling") deduplicated
the error handling, do the same for the return value of `map_deny_write_exec`.

Fixes: b507808ebce2 ("mm: implement memory-deny-write-execute as a prctl")
Reported-by: Alexey Izbyshev <izbyshev@...ras.ru>
Link: https://lore.kernel.org/linux-arm-kernel/8408d8901e9d7ee6b78db4c6cba04b78@ispras.ru/
Signed-off-by: Joey Gouly <joey.gouly@....com>
Cc: Catalin Marinas <catalin.marinas@....com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
---
 mm/mmap.c | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/mm/mmap.c b/mm/mmap.c
index 740b54be3ed4..ad499f7b767f 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -2621,12 +2621,7 @@ unsigned long mmap_region(struct file *file, unsigned long addr,
 
 	if (map_deny_write_exec(vma, vma->vm_flags)) {
 		error = -EACCES;
-		if (file)
-			goto close_and_free_vma;
-		else if (vma->vm_file)
-			goto unmap_and_free_vma;
-		else
-			goto free_vma;
+		goto close_and_free_vma;
 	}
 
 	/* Allow architectures to sanity-check the vm_flags */
-- 
2.17.1