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authorStefan Brüns <stefan.bruens@rwth-aachen.de>2016-09-06 04:36:56 +0200
committerTom Rini <trini@konsulko.com>2016-09-23 09:02:44 -0400
commitb1edcf0d8045d0b6929ce8d384fb7b350e3fc9ce (patch)
tree7b88747ce3c00e0b6f555bc0e7a5e268c4471392 /fs
parentde9e831675d72c08c2cc3361a8e9b413ff3facec (diff)
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ext4: Fix memory leak of journal buffer if block is updated multiple times
If the same block is updated multiple times in a row during a single file system operation, gd_index is decremented to use the same journal entry again. Avoid loosing the already allocated buffer. Signed-off-by: Stefan Brüns <stefan.bruens@rwth-aachen.de>
Diffstat (limited to 'fs')
-rw-r--r--fs/ext4/ext4_journal.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/fs/ext4/ext4_journal.c b/fs/ext4/ext4_journal.c
index cf14049..5a25be4 100644
--- a/fs/ext4/ext4_journal.c
+++ b/fs/ext4/ext4_journal.c
@@ -190,7 +190,11 @@ int ext4fs_put_metadata(char *metadata_buffer, uint32_t blknr)
printf("Invalid input arguments %s\n", __func__);
return -EINVAL;
}
- dirty_block_ptr[gd_index]->buf = zalloc(fs->blksz);
+ if (dirty_block_ptr[gd_index]->buf)
+ assert(dirty_block_ptr[gd_index]->blknr == blknr);
+ else
+ dirty_block_ptr[gd_index]->buf = zalloc(fs->blksz);
+
if (!dirty_block_ptr[gd_index]->buf)
return -ENOMEM;
memcpy(dirty_block_ptr[gd_index]->buf, metadata_buffer, fs->blksz);