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| author | Kalesh Singh <kaleshsingh@google.com> | 2020-12-30 00:14:40 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-12-30 00:36:49 +0100 |
| commit | e05986ee7a5814bec0e0075d813daca3d46e4a9e (patch) | |
| tree | 49d3a5bbfa9d636584d8e449c349cd0d75663bff /drivers/Makefile | |
| parent | mm: memmap defer init doesn't work as expected (diff) | |
| download | linux-e05986ee7a5814bec0e0075d813daca3d46e4a9e.tar.xz linux-e05986ee7a5814bec0e0075d813daca3d46e4a9e.zip | |
mm/mremap.c: fix extent calculation
When `next < old_addr`, `next - old_addr` arithmetic underflows causing
`extent` to be incorrect.
Make `extent` the smaller of `next - old_addr` or `old_end - old_addr`.
Link: https://lkml.kernel.org/r/20201219170433.2418867-1-kaleshsingh@google.com
Fixes: c49dd34018026 ("mm: speedup mremap on 1GB or larger regions")
Signed-off-by: Kalesh Singh <kaleshsingh@google.com>
Reported-by: Guenter Roeck <linux@roeck-us.net>
Tested-by: Guenter Roeck <linux@roeck-us.net>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Lokesh Gidra <lokeshgidra@google.com>
Cc: Helge Deller <deller@gmx.de>
Cc: Kalesh Singh <kaleshsingh@google.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/Makefile')
0 files changed, 0 insertions, 0 deletions