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staging: vme_user: Fix possible UAF in tsi148_dma_list_add

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[ Upstream commit 357057ee55d3c99a5de5abe8150f7bca04f8e53b ]

Smatch report warning as follows:

drivers/staging/vme_user/vme_tsi148.c:1757 tsi148_dma_list_add() warn:
  '&entry->list' not removed from list

In tsi148_dma_list_add(), the error path "goto err_dma" will not
remove entry->list from list->entries, but entry will be freed,
then list traversal may cause UAF.

Fix by removeing it from list->entries before free().

Fixes: b2383c90a9 ("vme: tsi148: fix first DMA item mapping")
Signed-off-by: Gaosheng Cui <cuigaosheng1@huawei.com>
Link: https://lore.kernel.org/r/20221117035914.2954454-1-cuigaosheng1@huawei.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Gaosheng Cui 2022-11-17 11:59:14 +08:00 • committed by Greg Kroah-Hartman
commit a45ba33d39
1 changed files with 1 additions and 0 deletions
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1
drivers/vme/bridges/vme_tsi148.c
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@ -1771,6 +1771,7 @@ static int tsi148_dma_list_add(struct vme_dma_list *list,
return 0;
err_dma:
list_del(&entry->list);
err_dest:
err_source:
err_align: