From fe079a5e102cc59b6c2b66a41e39c624ce284519 Mon Sep 17 00:00:00 2001
From: Alexey Dobriyan <adobriyan@gmail.com>
Date: Tue, 10 Apr 2018 16:32:05 -0700
Subject: [PATCH] proc: do mmput ASAP for /proc/*/map_files
mm_struct is not needed while printing as all the data was already
extracted.
Link: http://lkml.kernel.org/r/20180309223120.GC3843@avx2
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
fs/proc/base.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/proc/base.c b/fs/proc/base.c
index d413a138dc30f..eafa39a3a88cb 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -2211,6 +2211,7 @@ proc_map_files_readdir(struct file *file, struct dir_context *ctx)
}
}
up_read(&mm->mmap_sem);
+ mmput(mm);
for (i = 0; i < nr_files; i++) {
char buf[4 * sizeof(long) + 2]; /* max: %lx-%lx\0 */
@@ -2228,7 +2229,6 @@ proc_map_files_readdir(struct file *file, struct dir_context *ctx)
}
if (fa)
flex_array_free(fa);
- mmput(mm);
out_put_task:
put_task_struct(task);
--
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