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m68k: Add missing mmap_read_lock() to sys_cacheflush()

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commit f829b4b212a315b912cb23fd10aaf30534bb5ce9 upstream.

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: cd2567b685 ("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>
[ mmap_read_lock() open-coded using down_read() as was done prior to v5.8 ]
Signed-off-by: Finn Thain <fthain@linux-m68k.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Liam Howlett 2021-04-07 20:00:45 +00:00 • committed by Greg Kroah-Hartman
commit 28810b2aa0
1 changed files with 2 additions and 0 deletions
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arch/m68k/kernel/sys_m68k.c
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@ -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;
down_read(&current->mm->mmap_sem);
} else {
struct vm_area_struct *vma;