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-rw-r--r--lib/libalpm/util.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/lib/libalpm/util.c b/lib/libalpm/util.c
index 43f6cd52..0d499ad4 100644
--- a/lib/libalpm/util.c
+++ b/lib/libalpm/util.c
@@ -960,7 +960,9 @@ int _alpm_archive_fgets(struct archive *a, struct archive_read_buffer *b)
b->line_size = b->block_size + 1;
b->line_offset = b->line;
} else {
- size_t new = eol ? (eol - b->block_offset) : block_remaining;
+ /* note: we know eol > b->block_offset and b->line_offset > b->line,
+ * so we know the result is unsigned and can fit in size_t */
+ size_t new = eol ? (size_t)(eol - b->block_offset) : block_remaining;
size_t needed = (size_t)((b->line_offset - b->line) + new + 1);
if(needed > b->max_line_size) {
b->ret = -ERANGE;