Messages in this thread Patch in this message | | | From | trix@redhat ... | Subject | [PATCH] wireless: mwifiex: fix double free | Date | Sun, 4 Oct 2020 06:19:31 -0700 |
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From: Tom Rix <trix@redhat.com>
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@redhat.com> --- 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 69911c728eb1..bde9e4bbfffe 100644 --- a/drivers/net/wireless/marvell/mwifiex/sdio.c +++ b/drivers/net/wireless/marvell/mwifiex/sdio.c @@ -2403,6 +2403,8 @@ 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; -- 2.18.1
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