From: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
To: mchehab@kernel.org, hverkuil-cisco@xs4all.nl,
vaibhavgupta40@gmail.com, tglx@linutronix.de
Cc: linux-media@vger.kernel.org, linux-kernel@vger.kernel.org,
kernel-janitors@vger.kernel.org,
Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Subject: [PATCH] media: cx25821: Fix a bug when reallocating some dma memory
Date: Sat, 16 Jan 2021 22:21:46 +0100 [thread overview]
Message-ID: <20210116212146.555745-1-christophe.jaillet@wanadoo.fr> (raw)
This function looks like a realloc.
However, if 'risc->cpu != NULL', the memory will be freed, but never
reallocated with the bigger 'size'.
Explicitly set 'risc->cpu' to NULL, so that the reallocation is
correctly performed a few lines below.
Fixes: 5ede94c70553 ("[media] cx25821: remove bogus btcx_risc dependency)
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
---
Completly speculative and untested.
---
drivers/media/pci/cx25821/cx25821-core.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/media/pci/cx25821/cx25821-core.c b/drivers/media/pci/cx25821/cx25821-core.c
index 6f8ffab8840f..22e47dd74df4 100644
--- a/drivers/media/pci/cx25821/cx25821-core.c
+++ b/drivers/media/pci/cx25821/cx25821-core.c
@@ -976,8 +976,10 @@ int cx25821_riscmem_alloc(struct pci_dev *pci,
__le32 *cpu;
dma_addr_t dma = 0;
- if (NULL != risc->cpu && risc->size < size)
+ if (NULL != risc->cpu && risc->size < size) {
pci_free_consistent(pci, risc->size, risc->cpu, risc->dma);
+ risc->cpu = NULL;
+ }
if (NULL == risc->cpu) {
cpu = pci_zalloc_consistent(pci, size, &dma);
if (NULL == cpu)
--
2.27.0
reply other threads:[~2021-01-16 21:23 UTC|newest]
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