From: Prateek Sood prsood@codeaurora.org
commit 4965b8cd1bc1ffb017e5c58e622da82b55e49414 upstream.
vfree() is being called on paged buffer allocated using alloc_page() and mapped using vmap().
Freeing of pages in vfree() relies on nr_pages of struct vm_struct. vmap() does not update nr_pages. It can lead to memory leaks.
Fixes: ddaf29fd9bb6 ("firmware: Free temporary page table after vmapping") Signed-off-by: Prateek Sood prsood@codeaurora.org Reviewed-by: Takashi Iwai tiwai@suse.de Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/1597957070-27185-1-git-send-email-prsood@codeauror... Cc: Shuah Khan skhan@linuxfoundation.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/base/firmware_loader/firmware.h | 2 ++ drivers/base/firmware_loader/main.c | 17 +++++++++++------ 2 files changed, 13 insertions(+), 6 deletions(-)
--- a/drivers/base/firmware_loader/firmware.h +++ b/drivers/base/firmware_loader/firmware.h @@ -139,10 +139,12 @@ int assign_fw(struct firmware *fw, struc void fw_free_paged_buf(struct fw_priv *fw_priv); int fw_grow_paged_buf(struct fw_priv *fw_priv, int pages_needed); int fw_map_paged_buf(struct fw_priv *fw_priv); +bool fw_is_paged_buf(struct fw_priv *fw_priv); #else static inline void fw_free_paged_buf(struct fw_priv *fw_priv) {} static inline int fw_grow_paged_buf(struct fw_priv *fw_priv, int pages_needed) { return -ENXIO; } static inline int fw_map_paged_buf(struct fw_priv *fw_priv) { return -ENXIO; } +static inline bool fw_is_paged_buf(struct fw_priv *fw_priv) { return false; } #endif
#endif /* __FIRMWARE_LOADER_H */ --- a/drivers/base/firmware_loader/main.c +++ b/drivers/base/firmware_loader/main.c @@ -252,9 +252,11 @@ static void __free_fw_priv(struct kref * list_del(&fw_priv->list); spin_unlock(&fwc->lock);
- fw_free_paged_buf(fw_priv); /* free leftover pages */ - if (!fw_priv->allocated_size) + if (fw_is_paged_buf(fw_priv)) + fw_free_paged_buf(fw_priv); + else if (!fw_priv->allocated_size) vfree(fw_priv->data); + kfree_const(fw_priv->fw_name); kfree(fw_priv); } @@ -268,6 +270,11 @@ static void free_fw_priv(struct fw_priv }
#ifdef CONFIG_FW_LOADER_PAGED_BUF +bool fw_is_paged_buf(struct fw_priv *fw_priv) +{ + return fw_priv->is_paged_buf; +} + void fw_free_paged_buf(struct fw_priv *fw_priv) { int i; @@ -275,6 +282,8 @@ void fw_free_paged_buf(struct fw_priv *f if (!fw_priv->pages) return;
+ vunmap(fw_priv->data); + for (i = 0; i < fw_priv->nr_pages; i++) __free_page(fw_priv->pages[i]); kvfree(fw_priv->pages); @@ -328,10 +337,6 @@ int fw_map_paged_buf(struct fw_priv *fw_ if (!fw_priv->data) return -ENOMEM;
- /* page table is no longer needed after mapping, let's free */ - kvfree(fw_priv->pages); - fw_priv->pages = NULL; - return 0; } #endif