* [PATCH] imd: imd_calculate_crc32: initialize imd_crc to NULL
@ 2020-09-04 10:10 Hubert Feurstein
2020-09-04 12:49 ` Hubert Feurstein
0 siblings, 1 reply; 3+ messages in thread
From: Hubert Feurstein @ 2020-09-04 10:10 UTC (permalink / raw)
To: barebox
From: Hubert Feurstein <h.feurstein@gmail.com>
This fixes a NULL pointer dereference in the caller when imd-crc-token is
not found.
Signed-off-by: Hubert Feurstein <h.feurstein@gmail.com>
---
common/imd.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/common/imd.c b/common/imd.c
index 96496514a..0644e6d3b 100644
--- a/common/imd.c
+++ b/common/imd.c
@@ -312,6 +312,7 @@ static int imd_calculate_crc32(void *input, const struct imd_header *imd_start,
const struct imd_header *imd;
int length;
int end_ofs = (char *)imd_start - (char *)input + sizeof(char) * 8;
+ *imd_crc = NULL;
/* search the checksum imd token */
imd_for_each(imd_start, imd) {
--
2.28.0
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* Re: [PATCH] imd: imd_calculate_crc32: initialize imd_crc to NULL
2020-09-04 10:10 [PATCH] imd: imd_calculate_crc32: initialize imd_crc to NULL Hubert Feurstein
@ 2020-09-04 12:49 ` Hubert Feurstein
2020-09-14 10:21 ` Sascha Hauer
0 siblings, 1 reply; 3+ messages in thread
From: Hubert Feurstein @ 2020-09-04 12:49 UTC (permalink / raw)
To: barebox
Am Fr., 4. Sept. 2020 um 12:10 Uhr schrieb Hubert Feurstein
<h.feurstein@gmail.com>:
> This fixes a NULL pointer dereference in the caller when imd-crc-token is
> not found.
In fact, it is even worse, it is a "uninitialized pointer dereference".
Regards
Hubert
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* Re: [PATCH] imd: imd_calculate_crc32: initialize imd_crc to NULL
2020-09-04 12:49 ` Hubert Feurstein
@ 2020-09-14 10:21 ` Sascha Hauer
0 siblings, 0 replies; 3+ messages in thread
From: Sascha Hauer @ 2020-09-14 10:21 UTC (permalink / raw)
To: Hubert Feurstein; +Cc: barebox
Hi Hubert,
On Fri, Sep 04, 2020 at 02:49:15PM +0200, Hubert Feurstein wrote:
> Am Fr., 4. Sept. 2020 um 12:10 Uhr schrieb Hubert Feurstein
> <h.feurstein@gmail.com>:
> > This fixes a NULL pointer dereference in the caller when imd-crc-token is
> > not found.
> In fact, it is even worse, it is a "uninitialized pointer dereference".
Applied to master, thanks. I reworded the commit to:
This fixes a dereference of an uninitialized pointer when imd-crc-token
is not found.
Sascha
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2020-09-04 10:10 [PATCH] imd: imd_calculate_crc32: initialize imd_crc to NULL Hubert Feurstein
2020-09-04 12:49 ` Hubert Feurstein
2020-09-14 10:21 ` Sascha Hauer
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