diff options
author | Jack Steiner <steiner@sgi.com> | 2009-12-15 16:48:10 -0800 |
---|---|---|
committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-12-16 07:20:15 -0800 |
commit | e006043a4d2da52bba9fd9cb7e5a22e2951ff69b (patch) | |
tree | 21fcb2c1997b3070b54df12ec4102d2489deeecd /drivers/misc/sgi-gru/grufault.c | |
parent | 33f3648342dc40f8bd6383a5a1a91c22e06f6b77 (diff) | |
download | blackbird-op-linux-e006043a4d2da52bba9fd9cb7e5a22e2951ff69b.tar.gz blackbird-op-linux-e006043a4d2da52bba9fd9cb7e5a22e2951ff69b.zip |
gru: check for valid vma
Fix bug caused by failure to allocate a GRU gts structure. The old code
failed to handle the case where the vma was invalid.
Signed-off-by: Jack Steiner <steiner@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/misc/sgi-gru/grufault.c')
-rw-r--r-- | drivers/misc/sgi-gru/grufault.c | 21 |
1 files changed, 12 insertions, 9 deletions
diff --git a/drivers/misc/sgi-gru/grufault.c b/drivers/misc/sgi-gru/grufault.c index ada7df7e0968..7466234450f3 100644 --- a/drivers/misc/sgi-gru/grufault.c +++ b/drivers/misc/sgi-gru/grufault.c @@ -90,19 +90,22 @@ static struct gru_thread_state *gru_alloc_locked_gts(unsigned long vaddr) { struct mm_struct *mm = current->mm; struct vm_area_struct *vma; - struct gru_thread_state *gts = NULL; + struct gru_thread_state *gts = ERR_PTR(-EINVAL); down_write(&mm->mmap_sem); vma = gru_find_vma(vaddr); - if (vma) - gts = gru_alloc_thread_state(vma, TSID(vaddr, vma)); - if (!IS_ERR(gts)) { - mutex_lock(>s->ts_ctxlock); - downgrade_write(&mm->mmap_sem); - } else { - up_write(&mm->mmap_sem); - } + if (!vma) + goto err; + + gts = gru_alloc_thread_state(vma, TSID(vaddr, vma)); + if (IS_ERR(gts)) + goto err; + mutex_lock(>s->ts_ctxlock); + downgrade_write(&mm->mmap_sem); + return gts; +err: + up_write(&mm->mmap_sem); return gts; } |