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author | Sergey Poznyakoff <gray@gnu.org> | 2018-10-18 20:33:10 +0300 |
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committer | Sergey Poznyakoff <gray@gnu.org> | 2018-10-18 20:33:10 +0300 |
commit | 00ba17479ff31c6825f0e6f28b965f11525e83f6 (patch) | |
tree | fea289bb407672a6c03f73e7ba1157a0d32ae86d | |
parent | 852ff1b6e81ce13fdcd1fd4fb272b17d760760b3 (diff) | |
download | gdbm-00ba17479ff31c6825f0e6f28b965f11525e83f6.tar.gz gdbm-00ba17479ff31c6825f0e6f28b965f11525e83f6.tar.bz2 |
Restore backward compatibility with older databases
* src/gdbmopen.c (validate_header): Silently accept databases with next_block
pointing beyond end of file.
-rw-r--r-- | src/gdbmopen.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/src/gdbmopen.c b/src/gdbmopen.c index fe2527e..42f429d 100644 --- a/src/gdbmopen.c +++ b/src/gdbmopen.c @@ -170,5 +170,11 @@ validate_header (gdbm_file_header const *hdr, struct stat const *st) } - if (hdr->next_block != st->st_size) + /* Technically speaking, the condition below should read + hdr->next_block != st->st_size + However, gdbm versions prior to commit 4e819c98 could leave + hdr->next_block pointing beyond current end of file. To ensure + backward compatibility with these versions, the condition has been + slackened to this: */ + if (hdr->next_block < st->st_size) result = GDBM_NEED_RECOVERY; |