Patch "mm, fs: check for fatal signals in do_generic_file_read()" has been added to the 4.4-stable tree

This is a note to let you know that I've just added the patch titled

mm, fs: check for fatal signals in do_generic_file_read()

to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
mm-fs-check-for-fatal-signals-in-do_generic_file_read.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Michal Hocko <[email protected]>
Date: Fri, 3 Feb 2017 13:13:29 -0800
Subject: mm, fs: check for fatal signals in do_generic_file_read()

From: Michal Hocko <[email protected]>

commit 5abf186a30a89d5b9c18a6bf93a2c192c9fd52f6 upstream.

do_generic_file_read() can be told to perform a large request from userspace. If the system is under OOM and the reading task is the OOM victim then it has an access to memory reserves and finishing the full request can lead to the full memory depletion which is dangerous. Make sure we rather go with a short read and allow the killed task to terminate.

---
 mm/filemap.c |    5 +++++
 1 file changed, 5 insertions(+)

@@ -1559,6 +1559,11 @@ static ssize_t do_generic_file_read(stru
 
 		cond_resched();
 find_page:
+		if (fatal_signal_pending(current)) {
+			error = -EINTR;
+			goto out;
+		}
+
 		page = find_get_page(mapping, index);
 		if (!page) {
 			page_cache_sync_readahead(mapping,

Patches currently in stable-queue which might be from [email protected] are

queue-4.4/mm-fs-check-for-fatal-signals-in-do_generic_file_read.patch