diff options
| -rw-r--r-- | util/cbfstool/cbfstool.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/util/cbfstool/cbfstool.c b/util/cbfstool/cbfstool.c index 7f05f71b88..252929628f 100644 --- a/util/cbfstool/cbfstool.c +++ b/util/cbfstool/cbfstool.c @@ -101,7 +101,7 @@ static bool region_is_modern_cbfs(const char *region) /* * Converts between offsets from the start of the specified image region and - * "top-aligned" offsets from the top of the entire flash image. Works in either + * "top-aligned" offsets from the top of the image region. Works in either * direction: pass in one type of offset and receive the other type. * N.B. A top-aligned offset is always a positive number, and should not be * confused with a top-aliged *address*, which is its arithmetic inverse. */ @@ -110,6 +110,14 @@ static unsigned convert_to_from_top_aligned(const struct buffer *region, { assert(region); + /* cover the situation where a negative base address is given by the + * user. Callers of this function negate it, so it'll be a positive + * number smaller than the region. + */ + if ((offset > 0) && (offset < region->size)) { + return region->size - offset; + } + size_t image_size = partitioned_file_total_size(param.image_file); return image_size - region->offset - offset; } |