From 9afdd6128c39f42398041bb2e017d8df0dcebcd1 Mon Sep 17 00:00:00 2001 From: Johannes Thumshirn Date: Fri, 30 Sep 2016 14:39:17 +0200 Subject: [PATCH] cw1200: Don't leak memory if krealloc failes The call to krealloc() in wsm_buf_reserve() directly assigns the newly returned memory to buf->begin. This is all fine except when krealloc() failes we loose the ability to free the old memory pointed to by buf->begin. If we just create a temporary variable to assign memory to and assign the memory to it we can mitigate the memory leak. Signed-off-by: Johannes Thumshirn Cc: Johannes Berg Signed-off-by: Kalle Valo --- drivers/net/wireless/st/cw1200/wsm.c | 16 +++++++++------- 1 file changed, 9 insertions(+), 7 deletions(-) diff --git a/drivers/net/wireless/st/cw1200/wsm.c b/drivers/net/wireless/st/cw1200/wsm.c index 680d60eabc75..ffb245e941bb 100644 --- a/drivers/net/wireless/st/cw1200/wsm.c +++ b/drivers/net/wireless/st/cw1200/wsm.c @@ -1807,16 +1807,18 @@ static int wsm_buf_reserve(struct wsm_buf *buf, size_t extra_size) { size_t pos = buf->data - buf->begin; size_t size = pos + extra_size; + u8 *tmp; size = round_up(size, FWLOAD_BLOCK_SIZE); - buf->begin = krealloc(buf->begin, size, GFP_KERNEL | GFP_DMA); - if (buf->begin) { - buf->data = &buf->begin[pos]; - buf->end = &buf->begin[size]; - return 0; - } else { - buf->end = buf->data = buf->begin; + tmp = krealloc(buf->begin, size, GFP_KERNEL | GFP_DMA); + if (!tmp) { + wsm_buf_deinit(buf); return -ENOMEM; } + + buf->begin = tmp; + buf->data = &buf->begin[pos]; + buf->end = &buf->begin[size]; + return 0; } -- 2.20.1