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Kernel crashes during fill_read_buffer when nvme_info sysfs file read.
With multiple NVME targets, approx 40, nvme_info may grow larger than
PAGE_SIZE bytes. snprintf(buf + len, PAGE_SIZE - len, ...) logic is flawed
as PAGE_SIZE - len can be < 0 and is accepted by snprintf. This results in
buffer overflow, and is detected with check from dev_attr_show and
fill_read_buffer.
Change to use scnprintf to a tmp array, before calling strlcat to ensure no
buffer overflow over PAGE_SIZE bytes.
Message "6314" created as a new message indicating when there is more nvme
info, but is truncated to fit within PAGE_SIZE bytes.
Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com>
Signed-off-by: James Smart <james.smart@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
afff0d2321