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Commit 468f6597 authored by Richard Weinberger's avatar Richard Weinberger
Browse files

um: Fix hung task in fix_range_common() 



If do_ops() fails we have to release current->mm->mmap_sem
otherwise the failing task will never terminate.

Reported-by: default avatarToralf Förster <toralf.foerster@gmx.de>
Signed-off-by: default avatarRichard Weinberger <richard@nod.at>
parent 284e6d39

arch/um/kernel/tlb.c

+5 −1
Original line number Diff line number Diff line
@@ -12,6 +12,7 @@ 
#include <mem_user.h>

#include <os.h>

#include <skas.h>

#include <kern_util.h>



struct host_vm_change {

	struct host_vm_op {
@@ -286,8 +287,11 @@ void fix_range_common(struct mm_struct *mm, unsigned long start_addr, 
	/* This is not an else because ret is modified above */

	if (ret) {

		printk(KERN_ERR "fix_range_common: failed, killing current "

		       "process\n");

		       "process: %d\n", task_tgid_vnr(current));

		/* We are under mmap_sem, release it such that current can terminate */

		up_write(&current->mm->mmap_sem);

		force_sig(SIGKILL, current);

		do_signal();

	}

}