From fb099c8d2af6620db2709e826a258089d10cdfe8 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Zbigniew=20J=C4=99drzejewski-Szmek?= Date: Thu, 27 Feb 2014 00:07:29 -0500 Subject: [PATCH] journal: assume that next entry is after previous entry With a corrupted file, we can get in a situation where two entries in the entry array point to the same object. Then journal_file_next_entry will find the first one using generic_arrray_bisect, and try to move to the second one, but since the address is the same, generic_array_get will return the first one. journal_file_next_entry ends up in an infinite loop. https://bugzilla.redhat.com/show_bug.cgi?id=1047039 --- src/journal/journal-file.c | 26 ++++++++++++++++++++------ 1 file changed, 20 insertions(+), 6 deletions(-) diff --git src/journal/journal-file.c src/journal/journal-file.c index 5876733..0e1fc7f 100644 --- src/journal/journal-file.c +++ src/journal/journal-file.c @@ -1359,7 +1359,7 @@ int journal_file_append_entry(JournalFile *f, const dual_timestamp *ts, const st } typedef struct ChainCacheItem { - uint64_t first; /* the array at the begin of the chain */ + uint64_t first; /* the array at the beginning of the chain */ uint64_t array; /* the cached array */ uint64_t begin; /* the first item in the cached array */ uint64_t total; /* the total number of items in all arrays before this one in the chain */ @@ -1945,7 +1945,7 @@ int journal_file_next_entry( direction_t direction, Object **ret, uint64_t *offset) { - uint64_t i, n; + uint64_t i, n, ofs; int r; assert(f); @@ -1986,10 +1986,24 @@ int journal_file_next_entry( } /* And jump to it */ - return generic_array_get(f, - le64toh(f->header->entry_array_offset), - i, - ret, offset); + r = generic_array_get(f, + le64toh(f->header->entry_array_offset), + i, + ret, &ofs); + if (r <= 0) + return r; + + if (p > 0 && + (direction == DIRECTION_DOWN ? ofs <= p : ofs >= p)) { + log_debug("%s: entry array corrupted at entry %"PRIu64, + f->path, i); + return -EBADMSG; + } + + if (offset) + *offset = ofs; + + return 1; } int journal_file_skip_entry( -- 1.7.9.2