Fix line_offset not being reset in _alpm_archive_fgets()

This is a rather serious data corruption issue that luckily manifested
itself today in a noticable way. A package in testing had replaces
entries read in as ["%RE pkgname", "%RE"] which was clearly wrong. This
happens when we hit the end of an archive block, do not have a newline,
and have to continue reading from the next block to complete the line.

Signed-off-by: Dan McGee <dan@archlinux.org>

1 files changed, 3 insertions, 0 deletions

diff --git a/lib/libalpm/util.c b/lib/libalpm/util.c
index 74e14058..11e69041 100644
--- a/lib/libalpm/util.c
+++ b/lib/libalpm/util.c
@@ -740,6 +740,9 @@ int _alpm_archive_fgets(struct archive *a, struct archive_read_buffer *b)
 	int64_t offset;
 	int done = 0;
 
+	/* ensure we start populating our line buffer at the beginning */
+	b->line_offset = b->line;
+
 	while(1) {
 		/* have we processed this entire block? */
 		if(b->block + b->block_size == b->block_offset) {