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| author | Alexey Khoroshilov <khoroshilov@ispras.ru> | 2012-08-08 12:53:07 +0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-08-10 12:06:39 -0700 |
| commit | 05f2b3912323b4130dbf6d5091601d9ca3aaf119 (patch) | |
| tree | b92d2ba4a7244ed594cb717334004190c9b376ec | |
| parent | e58ba01e2cfe7b7d54d28f78c7af3cff4d5419a3 (diff) | |
| download | blackbird-op-linux-05f2b3912323b4130dbf6d5091601d9ca3aaf119.tar.gz blackbird-op-linux-05f2b3912323b4130dbf6d5091601d9ca3aaf119.zip | |
USB: whci-hcd: Fix potential memory leak in qset_add_urb_sg()
Do not leak memory by updating pointer with potentially
NULL realloc return value.
By the way remove unused local variable:
struct whc_page_list_entry *entry;
More precisely, it was used to increment uninitialized value within one of cycles.
Found by Linux Driver Verification project (linuxtesting.org).
Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/usb/host/whci/qset.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/drivers/usb/host/whci/qset.c b/drivers/usb/host/whci/qset.c index 76083ae92138..dc31c425ce01 100644 --- a/drivers/usb/host/whci/qset.c +++ b/drivers/usb/host/whci/qset.c @@ -436,7 +436,7 @@ static int qset_add_urb_sg(struct whc *whc, struct whc_qset *qset, struct urb *u int i; int ntds = 0; struct whc_std *std = NULL; - struct whc_page_list_entry *entry; + struct whc_page_list_entry *new_pl_virt; dma_addr_t prev_end = 0; size_t pl_len; int p = 0; @@ -508,12 +508,15 @@ static int qset_add_urb_sg(struct whc *whc, struct whc_qset *qset, struct urb *u pl_len = std->num_pointers * sizeof(struct whc_page_list_entry); - std->pl_virt = krealloc(std->pl_virt, pl_len, mem_flags); - if (std->pl_virt == NULL) { + new_pl_virt = krealloc(std->pl_virt, pl_len, mem_flags); + if (new_pl_virt == NULL) { + kfree(std->pl_virt); + std->pl_virt = NULL; return -ENOMEM; } + std->pl_virt = new_pl_virt; - for (;p < std->num_pointers; p++, entry++) { + for (;p < std->num_pointers; p++) { std->pl_virt[p].buf_ptr = cpu_to_le64(dma_addr); dma_addr = (dma_addr + WHCI_PAGE_SIZE) & ~(WHCI_PAGE_SIZE-1); } |
