From: "Gustavo A. R. Silva" <gustavo@embeddedor.com>
To: Clemens Ladisch <clemens@ladisch.de>,
Arnd Bergmann <arnd@arndb.de>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
"Gustavo A. R. Silva" <gustavo@embeddedor.com>
Cc: linux-kernel@vger.kernel.org,
"Gustavo A. R. Silva" <gustavo@embeddedor.com>
Subject: [PATCH] char: hpet: Fix out-of-bounds read bug
Date: Tue, 28 Jan 2020 20:26:13 -0600
Message-ID: <20200129022613.GA24281@embeddedor.com> (raw)
Currently, there is an out-of-bounds read on array hpetp->hp_dev
in the following for loop:
870 for (i = 0; i < hdp->hd_nirqs; i++)
871 hpetp->hp_dev[i].hd_hdwirq = hdp->hd_irq[i];
This is due to the recent change from one-element array to
flexible-array member in struct hpets:
104 struct hpets {
...
113 struct hpet_dev hp_dev[];
114 };
This change affected the total size of the dynamic memory
allocation, decreasing it by one time the size of struct hpet_dev.
Fix this by adjusting the allocation size when calling
struct_size().
Fixes: 987f028b8637c ("char: hpet: Use flexible-array member")
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
---
Here to fix what I break. :p Sorry...
drivers/char/hpet.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/char/hpet.c b/drivers/char/hpet.c
index aed2c45f7968..ed3b7dab678d 100644
--- a/drivers/char/hpet.c
+++ b/drivers/char/hpet.c
@@ -855,7 +855,7 @@ int hpet_alloc(struct hpet_data *hdp)
return 0;
}
- hpetp = kzalloc(struct_size(hpetp, hp_dev, hdp->hd_nirqs - 1),
+ hpetp = kzalloc(struct_size(hpetp, hp_dev, hdp->hd_nirqs),
GFP_KERNEL);
if (!hpetp)
--
2.23.0
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