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be_sync: avoid crashing on files in the root of a DB

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If a sync DB is malformed and contains entries in the root of the
archive, load_pkg_for_entry will leave the 'filename' variable empty,
leading to a crash in the ensuing strcmp() calls which determine the DB
fragment being examined.

While this isn't a read error, this should be reported to the user so
that it can be addressed by the creator of the DB.

As seen: https://bbs.archlinux.org/viewtopic.php?pid=1297766

Signed-off-by: Dave Reisner <dreisner@archlinux.org>
This commit is contained in:
Dave Reisner 2013-07-07 19:52:13 -04:00 committed by Allan McRae
parent ef6b6fe065
commit 24abcddc57
1 changed files with 8 additions and 0 deletions
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8
lib/libalpm/be_sync.c
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@ -562,6 +562,14 @@ static int sync_db_read(alpm_db_t *db, struct archive *archive,
return -1;
}
if(filename == NULL) {
/* A file exists outside of a subdirectory. This isn't a read error, so return
* success and try to continue on. */
_alpm_log(db->handle, ALPM_LOG_WARNING, _("unknown database file: %s\n"),
filename);
return 0;
}
if(strcmp(filename, "desc") == 0 || strcmp(filename, "depends") == 0
|| (strcmp(filename, "deltas") == 0 && db->handle->deltaratio > 0.0) ) {
int ret;