Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: f2fs: fix valid block count leak on data block allocation failure In __allocate_data_block(), when allocating a new data block (dn->data_blkaddr == NULL_ADDR), inc_valid_block_count() is called first to increment total_valid_block_count and i_blocks. If the subsequent f2fs_allocate_data_block() fails, the function returns the error directly without rolling back the already-incremented block counts, causing a permanent leak. Fix this by calling dec_valid_block_count() to undo the increment before returning the error. The condition old_blkaddr == NULL_ADDR precisely identifies the case where inc_valid_block_count() was called.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 7d009e048d7cfcc21d400f2aba4c8bacbdebbd47 before 2d50b6d47e5671ff6a25834c5906d443356191f0; affected 7d009e048d7cfcc21d400f2aba4c8bacbdebbd47 before dde99df5a9d3b0ca6ac0a86f98799685f7399432; affected 7d009e048d7cfcc21d400f2aba4c8bacbdebbd47 before 931e1aa4d44c52ff8e0feb38420a8827c62e886b; affected 7d009e048d7cfcc21d400f2aba4c8bacbdebbd47 before 0f9af07ecc1ab486038373db6ae0436c5d674b19 |
| Linux / Linux | affected 6.9; unaffected 0 before 6.9; unaffected 6.12.110 through 6.12.*; unaffected 6.18.51 through 6.18.*; unaffected 7.2.5 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.