[PATCH] Before adding to usablemem_rgns, check if the memory range is already included.

[Simon Horman]

On Thu, Oct 17, 2024 at 08:38:59PM +0800, Chen Haixiang wrote:
> When kexec_iomem_for_each_line() reads from /proc/iomem,
> concurrent modifications to /proc/iomem may lead to
> usablemem_rgns recording duplicate Crash kernel segments.
> This can result in the number of retrieved Crash kernel
> segments exceeding CRASH_MAX_RESERVED_RANGES, triggering
> a realloc of the crash_reserved_mem in usablemem_rgns,
> which could crash the process. We should ensure that each
> range added to usablemem_rgns is unique to prevent these issues.

Thanks Chen Haixiang,

This looks reasonable to me, but, as per Kernel submissions,
I will need an Signed-off-by line [1] in order to apply this patch.

[1] https://www.kernel.org/doc/html/latest/process/submitting-patches.html#sign-your-work-the-developer-s-certificate-of-origin