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| author | Roberto Bergantinos Corpas <rbergant@redhat.com> | 2019-05-28 09:38:14 +0200 |
|---|---|---|
| committer | Steve French <stfrench@microsoft.com> | 2019-05-29 14:02:11 -0500 |
| commit | 31fad7d41e73731f05b8053d17078638cf850fa6 (patch) | |
| tree | a3f2c3ddb1bc7355b7fb2c1769d1ff428acc489a | |
| parent | 50fbc13dc12666f3604dc2555a47fc8c4e29162b (diff) | |
| download | lwn-31fad7d41e73731f05b8053d17078638cf850fa6.tar.gz lwn-31fad7d41e73731f05b8053d17078638cf850fa6.zip | |
CIFS: cifs_read_allocate_pages: don't iterate through whole page array on ENOMEM
In cifs_read_allocate_pages, in case of ENOMEM, we go through
whole rdata->pages array but we have failed the allocation before
nr_pages, therefore we may end up calling put_page with NULL
pointer, causing oops
Signed-off-by: Roberto Bergantinos Corpas <rbergant@redhat.com>
Acked-by: Pavel Shilovsky <pshilov@microsoft.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
CC: Stable <stable@vger.kernel.org>
| -rw-r--r-- | fs/cifs/file.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/fs/cifs/file.c b/fs/cifs/file.c index ce9a5be11df5..06e27ac6d82c 100644 --- a/fs/cifs/file.c +++ b/fs/cifs/file.c @@ -3216,7 +3216,9 @@ cifs_read_allocate_pages(struct cifs_readdata *rdata, unsigned int nr_pages) } if (rc) { - for (i = 0; i < nr_pages; i++) { + unsigned int nr_page_failed = i; + + for (i = 0; i < nr_page_failed; i++) { put_page(rdata->pages[i]); rdata->pages[i] = NULL; } |