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dma-buf: acquire name lock before read/write dma_buf.name 

Because dma-buf.name can be freed in func: "dma_buf_set_name",
so, we need to acquire lock first before we read/write dma_buf.name
to prevent Use After Free(UAF) issue.

Signed-off-by: Guangming Cao <Guangming.Cao@mediatek.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Christian König <christian.koenig@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211008075420.42874-1-guangming.cao@mediatek.com
This commit is contained in:
Guangming Cao 2021-10-08 15:54:20 +08:00 committed by Christian König
parent 61b1d445f3
commit 8c0fd12626
1 changed files with 3 additions and 0 deletions
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3
drivers/dma-buf/dma-buf.c
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@ -1389,6 +1389,8 @@ static int dma_buf_debug_show(struct seq_file *s, void *unused)
if (ret)
goto error_unlock;
spin_lock(&buf_obj->name_lock);
seq_printf(s, "%08zu\t%08x\t%08x\t%08ld\t%s\t%08lu\t%s\n",
buf_obj->size,
buf_obj->file->f_flags, buf_obj->file->f_mode,
@ -1396,6 +1398,7 @@ static int dma_buf_debug_show(struct seq_file *s, void *unused)
buf_obj->exp_name,
file_inode(buf_obj->file)->i_ino,
buf_obj->name ?: "");
spin_unlock(&buf_obj->name_lock);
robj = buf_obj->resv;
fence = dma_resv_excl_fence(robj);