diff options
| author | Pavel Shilovsky <pshilov@microsoft.com> | 2019-01-23 17:12:09 -0800 |
|---|---|---|
| committer | Steve French <stfrench@microsoft.com> | 2019-01-29 17:19:47 -0600 |
| commit | 9bda8723da2d55b1de833b98cf802b88006e5b69 (patch) | |
| tree | 6e4bc7fe28000e5bba3674b5110f2bb91bb5999d /fs/cifs/file.c | |
| parent | c4627e66f73a28c5515b908c90c2bf7120086497 (diff) | |
| download | lwn-9bda8723da2d55b1de833b98cf802b88006e5b69.tar.gz lwn-9bda8723da2d55b1de833b98cf802b88006e5b69.zip | |
CIFS: Fix possible oops and memory leaks in async IO
Allocation of a page array for non-cached IO was separated from
allocation of rdata and wdata structures and this introduced memory
leaks and a possible null pointer dereference. This patch fixes
these problems.
Cc: <stable@vger.kernel.org>
Signed-off-by: Pavel Shilovsky <pshilov@microsoft.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Diffstat (limited to 'fs/cifs/file.c')
| -rw-r--r-- | fs/cifs/file.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/fs/cifs/file.c b/fs/cifs/file.c index 2c7689f3998d..659ce1b92c44 100644 --- a/fs/cifs/file.c +++ b/fs/cifs/file.c @@ -2696,6 +2696,7 @@ cifs_write_from_iter(loff_t offset, size_t len, struct iov_iter *from, rc = cifs_write_allocate_pages(wdata->pages, nr_pages); if (rc) { + kvfree(wdata->pages); kfree(wdata); add_credits_and_wake_if(server, credits, 0); break; @@ -2707,6 +2708,7 @@ cifs_write_from_iter(loff_t offset, size_t len, struct iov_iter *from, if (rc) { for (i = 0; i < nr_pages; i++) put_page(wdata->pages[i]); + kvfree(wdata->pages); kfree(wdata); add_credits_and_wake_if(server, credits, 0); break; @@ -3386,8 +3388,12 @@ cifs_send_async_read(loff_t offset, size_t len, struct cifsFileInfo *open_file, } rc = cifs_read_allocate_pages(rdata, npages); - if (rc) - goto error; + if (rc) { + kvfree(rdata->pages); + kfree(rdata); + add_credits_and_wake_if(server, credits, 0); + break; + } rdata->tailsz = PAGE_SIZE; } @@ -3407,7 +3413,6 @@ cifs_send_async_read(loff_t offset, size_t len, struct cifsFileInfo *open_file, if (!rdata->cfile->invalidHandle || !(rc = cifs_reopen_file(rdata->cfile, true))) rc = server->ops->async_readv(rdata); -error: if (rc) { add_credits_and_wake_if(server, rdata->credits, 0); kref_put(&rdata->refcount, |