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cw1200: Don't leak memory if krealloc failes

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commit 9afdd6128c39f42398041bb2e017d8df0dcebcd1 upstream.

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 <jthumshirn@suse.de>
Cc: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Signed-off-by: Amit Pundir <amit.pundir@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johannes Thumshirn 2016-09-30 14:39:17 +02:00 • committed by Greg Kroah-Hartman
parent 4dceeae8b8
commit 63238079b4
1 changed files with 9 additions and 7 deletions
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16
drivers/net/wireless/cw1200/wsm.c
View file

@ -1805,16 +1805,18 @@ 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;
}