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Date: Tue, 27 Oct 2020 14:48:56 +0100 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Tom Rix <trix@...hat.com>, Brian Norris <briannorris@...omium.org>, Kalle Valo <kvalo@...eaurora.org>, Sasha Levin <sashal@...nel.org> Subject: [PATCH 4.14 081/191] mwifiex: fix double free From: Tom Rix <trix@...hat.com> [ Upstream commit 53708f4fd9cfe389beab5c8daa763bcd0e0b4aef ] clang static analysis reports this problem: sdio.c:2403:3: warning: Attempt to free released memory kfree(card->mpa_rx.buf); ^~~~~~~~~~~~~~~~~~~~~~~ When mwifiex_init_sdio() fails in its first call to mwifiex_alloc_sdio_mpa_buffer, it falls back to calling it again. If the second alloc of mpa_tx.buf fails, the error handler will try to free the old, previously freed mpa_rx.buf. Reviewing the code, it looks like a second double free would happen with mwifiex_cleanup_sdio(). So set both pointers to NULL when they are freed. Fixes: 5e6e3a92b9a4 ("wireless: mwifiex: initial commit for Marvell mwifiex driver") Signed-off-by: Tom Rix <trix@...hat.com> Reviewed-by: Brian Norris <briannorris@...omium.org> Signed-off-by: Kalle Valo <kvalo@...eaurora.org> Link: https://lore.kernel.org/r/20201004131931.29782-1-trix@redhat.com Signed-off-by: Sasha Levin <sashal@...nel.org> --- drivers/net/wireless/marvell/mwifiex/sdio.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/net/wireless/marvell/mwifiex/sdio.c b/drivers/net/wireless/marvell/mwifiex/sdio.c index fd5183c10c4ed..0e858621eef32 100644 --- a/drivers/net/wireless/marvell/mwifiex/sdio.c +++ b/drivers/net/wireless/marvell/mwifiex/sdio.c @@ -1973,6 +1973,8 @@ static int mwifiex_alloc_sdio_mpa_buffers(struct mwifiex_adapter *adapter, kfree(card->mpa_rx.buf); card->mpa_tx.buf_size = 0; card->mpa_rx.buf_size = 0; + card->mpa_tx.buf = NULL; + card->mpa_rx.buf = NULL; } return ret; -- 2.25.1
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