* [edk2-libc Patch] StdLib/LibC/Uefi/Devices/Utility: Fix use after free
@ 2021-08-18 23:45 Michael D Kinney
2021-08-19 1:45 ` Rebecca Cran
0 siblings, 1 reply; 2+ messages in thread
From: Michael D Kinney @ 2021-08-18 23:45 UTC (permalink / raw)
To: devel; +Cc: Rebecca Cran
REF: https://bugzilla.tianocore.org/show_bug.cgi?id=38
Set MPath to NULL after free(MPath) to guarantee that MPath
is not used after the free() call.
Cc: Rebecca Cran <rebecca@nuviainc.com>
Signed-off-by: Michael D Kinney <michael.d.kinney@intel.com>
---
StdLib/LibC/Uefi/Devices/Utility/Path.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/StdLib/LibC/Uefi/Devices/Utility/Path.c b/StdLib/LibC/Uefi/Devices/Utility/Path.c
index d6728d3..fe19196 100644
--- a/StdLib/LibC/Uefi/Devices/Utility/Path.c
+++ b/StdLib/LibC/Uefi/Devices/Utility/Path.c
@@ -359,6 +359,7 @@ reclassify:
}
else if(MPath != NULL) {
free(MPath); /* Caller doesn't want it so let MPath go free */
+ MPath = NULL;
}
/* At this point, WPath is an absolute path,
--
2.32.0.windows.1
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [edk2-libc Patch] StdLib/LibC/Uefi/Devices/Utility: Fix use after free
2021-08-18 23:45 [edk2-libc Patch] StdLib/LibC/Uefi/Devices/Utility: Fix use after free Michael D Kinney
@ 2021-08-19 1:45 ` Rebecca Cran
0 siblings, 0 replies; 2+ messages in thread
From: Rebecca Cran @ 2021-08-19 1:45 UTC (permalink / raw)
To: Michael D Kinney, devel
Reviewed-by: Rebecca Cran <rebecca@nuviainc.com>
--
Rebecca Cran
On 8/18/21 5:45 PM, Michael D Kinney wrote:
> REF: https://bugzilla.tianocore.org/show_bug.cgi?id=38
>
> Set MPath to NULL after free(MPath) to guarantee that MPath
> is not used after the free() call.
>
> Cc: Rebecca Cran <rebecca@nuviainc.com>
> Signed-off-by: Michael D Kinney <michael.d.kinney@intel.com>
> ---
> StdLib/LibC/Uefi/Devices/Utility/Path.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/StdLib/LibC/Uefi/Devices/Utility/Path.c b/StdLib/LibC/Uefi/Devices/Utility/Path.c
> index d6728d3..fe19196 100644
> --- a/StdLib/LibC/Uefi/Devices/Utility/Path.c
> +++ b/StdLib/LibC/Uefi/Devices/Utility/Path.c
> @@ -359,6 +359,7 @@ reclassify:
> }
> else if(MPath != NULL) {
> free(MPath); /* Caller doesn't want it so let MPath go free */
> + MPath = NULL;
> }
>
> /* At this point, WPath is an absolute path,
^ permalink raw reply [flat|nested] 2+ messages in thread
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