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| author | Liam Howlett <liam.howlett@oracle.com> | 2021-04-07 23:00:45 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-05-14 10:50:19 +0300 |
| commit | 58ee5a0de192f698b136128154b32773d946ec47 (patch) | |
| tree | bfa80e87fe9f28bdbf161dd499c1b1cc9c553576 /arch/m68k | |
| parent | 99d2fa2daf6da877e85c0ee8dd3a3a1fc4194b64 (diff) | |
| download | linux-58ee5a0de192f698b136128154b32773d946ec47.tar.xz | |
m68k: Add missing mmap_read_lock() to sys_cacheflush()
[ Upstream commit f829b4b212a315b912cb23fd10aaf30534bb5ce9 ]
When the superuser flushes the entire cache, the mmap_read_lock() is not
taken, but mmap_read_unlock() is called. Add the missing
mmap_read_lock() call.
Fixes: cd2567b6850b1648 ("m68k: call find_vma with the mmap_sem held in sys_cacheflush()")
Signed-off-by: Liam R. Howlett <Liam.Howlett@Oracle.com>
Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Link: https://lore.kernel.org/r/20210407200032.764445-1-Liam.Howlett@Oracle.com
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'arch/m68k')
| -rw-r--r-- | arch/m68k/kernel/sys_m68k.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/m68k/kernel/sys_m68k.c b/arch/m68k/kernel/sys_m68k.c index 1c235d8f53f3..f55bdcb8e4f1 100644 --- a/arch/m68k/kernel/sys_m68k.c +++ b/arch/m68k/kernel/sys_m68k.c @@ -388,6 +388,8 @@ sys_cacheflush (unsigned long addr, int scope, int cache, unsigned long len) ret = -EPERM; if (!capable(CAP_SYS_ADMIN)) goto out; + + mmap_read_lock(current->mm); } else { struct vm_area_struct *vma; |