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block: do not leak memory in bio_copy_user_iov()

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When bio_add_pc_page() fails in bio_copy_user_iov() we should free
the page we just allocated otherwise we are leaking it.

Cc: [email protected]
Cc: Linus Torvalds <[email protected]>
Cc: [email protected]
Reviewed-by: Chaitanya Kulkarni <[email protected]>
Signed-off-by: Jérôme Glisse <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Jérôme Glisse 2019-04-10 16:27:51 -04:00 • committed by Jens Axboe
commit a3761c3c91
1 changed files with 4 additions and 1 deletions
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5
block/bio.c
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@ -1298,8 +1298,11 @@ struct bio *bio_copy_user_iov(struct request_queue *q,
}
}
if (bio_add_pc_page(q, bio, page, bytes, offset) < bytes)
if (bio_add_pc_page(q, bio, page, bytes, offset) < bytes) {
if (!map_data)
__free_page(page);
break;
}
len -= bytes;
offset = 0;