+ mm-mmap-use-advanced-maple-tree-api-for-mmap_region-fix-2.patch added to mm-unstable branch

+ mm-mmap-use-advanced-maple-tree-api-for-mmap_region-fix-2.patch added to mm-unstable branch

[Andrew Morton]

The patch titled
     Subject: mm/mmap: qvoid dereferencing next on null in BUG_ON()
has been added to the -mm mm-unstable branch.  Its filename is
     mm-mmap-use-advanced-maple-tree-api-for-mmap_region-fix-2.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-mmap-use-advanced-maple-tree-api-for-mmap_region-fix-2.patch

This patch will later appear in the mm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Before you just go and hit "reply", please:
   a) Consider who else should be cc'ed
   b) Prefer to cc a suitable mailing list as well
   c) Ideally: find the original patch on the mailing list and do a
      reply-to-all to that, adding suitable additional cc's

*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***

The -mm tree is included into linux-next via the mm-everything
branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
and is updated there every 2-3 working days

------------------------------------------------------
From: Liam Howlett <liam.howlett@oracle.com>
Subject: mm/mmap: qvoid dereferencing next on null in BUG_ON()
Date: Thu, 19 May 2022 15:04:50 +0000

Check there is a next before checking the bounds.

Link: https://lkml.kernel.org/r/20220519150442.1289962-1-Liam.Howlett@oracle.com
Signed-off-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Reported-by: <syzbot+ee1fdd8dcc770a3a169a@syzkaller.appspotmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/mmap.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/mm/mmap.c~mm-mmap-use-advanced-maple-tree-api-for-mmap_region-fix-2
+++ a/mm/mmap.c
@@ -685,7 +685,7 @@ inline int vma_expand(struct ma_state *m
 	}
 
 	/* Not merging but overwriting any part of next is not handled. */
-	VM_BUG_ON(!remove_next && next != vma && end > next->vm_start);
+	VM_BUG_ON(next && !remove_next && next != vma && end > next->vm_start);
 	/* Only handles expanding */
 	VM_BUG_ON(vma->vm_start < start || vma->vm_end > end);
 
_

Patches currently in -mm which might be from liam.howlett@oracle.com are

+ mm-mmap-use-advanced-maple-tree-api-for-mmap_region-fix-2.patch added to mm-unstable branch

[Andrew Morton]

The patch titled
     Subject: mm/mmap: qvoid dereferencing next on null in BUG_ON()
has been added to the -mm mm-unstable branch.  Its filename is
     mm-mmap-use-advanced-maple-tree-api-for-mmap_region-fix-2.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-mmap-use-advanced-maple-tree-api-for-mmap_region-fix-2.patch

This patch will later appear in the mm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Before you just go and hit "reply", please:
   a) Consider who else should be cc'ed
   b) Prefer to cc a suitable mailing list as well
   c) Ideally: find the original patch on the mailing list and do a
      reply-to-all to that, adding suitable additional cc's

*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***

The -mm tree is included into linux-next via the mm-everything
branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
and is updated there every 2-3 working days

------------------------------------------------------
From: Liam Howlett <liam.howlett@oracle.com>
Subject: mm/mmap: qvoid dereferencing next on null in BUG_ON()
Date: Thu, 19 May 2022 15:04:50 +0000

Check there is a next before checking the bounds.

Link: https://lkml.kernel.org/r/20220519150442.1289962-1-Liam.Howlett@oracle.com
Signed-off-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Reported-by: <syzbot+ee1fdd8dcc770a3a169a@syzkaller.appspotmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/mmap.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/mm/mmap.c~mm-mmap-use-advanced-maple-tree-api-for-mmap_region-fix-2
+++ a/mm/mmap.c
@@ -685,7 +685,7 @@ inline int vma_expand(struct ma_state *m
 	}
 
 	/* Not merging but overwriting any part of next is not handled. */
-	VM_BUG_ON(!remove_next && next != vma && end > next->vm_start);
+	VM_BUG_ON(next && !remove_next && next != vma && end > next->vm_start);
 	/* Only handles expanding */
 	VM_BUG_ON(vma->vm_start < start || vma->vm_end > end);
 
_

Patches currently in -mm which might be from liam.howlett@oracle.com are

maple-tree-add-new-data-structure-fix.patch
maple-tree-add-new-data-structure-fix-2.patch
maple-tree-add-new-data-structure-fix-3.patch
maple-tree-add-new-data-structure-fix-4.patch
lib-test_maple_tree-add-testing-for-maple-tree-fix.patch
mm-start-tracking-vmas-with-maple-tree-fix-2.patch
mm-mmap-use-advanced-maple-tree-api-for-mmap_region-fix-2.patch
mm-mmap-change-do_brk_munmap-to-use-do_mas_align_munmap-fix.patch
mm-remove-the-vma-linked-list-fix.patch

+ mm-mmap-use-advanced-maple-tree-api-for-mmap_region-fix-2.patch added to mm-unstable branch

[Andrew Morton]

The patch titled
     Subject: mm/mmap: qvoid dereferencing next on null in BUG_ON()
has been added to the -mm mm-unstable branch.  Its filename is
     mm-mmap-use-advanced-maple-tree-api-for-mmap_region-fix-2.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-mmap-use-advanced-maple-tree-api-for-mmap_region-fix-2.patch

This patch will later appear in the mm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Before you just go and hit "reply", please:
   a) Consider who else should be cc'ed
   b) Prefer to cc a suitable mailing list as well
   c) Ideally: find the original patch on the mailing list and do a
      reply-to-all to that, adding suitable additional cc's

*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***

The -mm tree is included into linux-next via the mm-everything
branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
and is updated there every 2-3 working days

------------------------------------------------------
From: Liam Howlett <liam.howlett@oracle.com>
Subject: mm/mmap: qvoid dereferencing next on null in BUG_ON()
Date: Thu, 19 May 2022 15:04:50 +0000

Check there is a next before checking the bounds.

Link: https://lkml.kernel.org/r/20220519150442.1289962-1-Liam.Howlett@oracle.com
Signed-off-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/mmap.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/mm/mmap.c~mm-mmap-use-advanced-maple-tree-api-for-mmap_region-fix-2
+++ a/mm/mmap.c
@@ -685,7 +685,7 @@ inline int vma_expand(struct ma_state *m
 	}
 
 	/* Not merging but overwriting any part of next is not handled. */
-	VM_BUG_ON(!remove_next && next != vma && end > next->vm_start);
+	VM_BUG_ON(next && !remove_next && next != vma && end > next->vm_start);
 	/* Only handles expanding */
 	VM_BUG_ON(vma->vm_start < start || vma->vm_end > end);
 
_

Patches currently in -mm which might be from liam.howlett@oracle.com are

maple-tree-add-new-data-structure-fix.patch
maple-tree-add-new-data-structure-fix-2.patch
maple-tree-add-new-data-structure-fix-3.patch
maple-tree-add-new-data-structure-fix-4.patch
lib-test_maple_tree-add-testing-for-maple-tree-fix.patch
mm-start-tracking-vmas-with-maple-tree-fix-2.patch
mm-mmap-use-advanced-maple-tree-api-for-mmap_region-fix-2.patch
mm-remove-the-vma-linked-list-fix.patch