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drivers/lightnvm: fix a null-ptr-deref bug in pblk-core.c 

At line 294 in drivers/lightnvm/pblk-write.c, function pblk_gen_run_ws is
called with actual param GFP_ATOMIC. pblk_gen_run_ws call mempool_alloc
using "GFP_ATOMIC" flag, so mempool_alloc can return null. So we need to
check the return-val of mempool_alloc to avoid null-ptr-deref bug.

Signed-off-by: tangzhenhao <tzh18@mails.tsinghua.edu.cn>
Reviewed-by: Matias Bjørling <mb@lightnvm.io>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
tangzhenhao 2020-11-29 23:23:56 -08:00 committed by Jens Axboe
parent eebf34a85c
commit f87905660e
1 changed files with 4 additions and 0 deletions
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4
drivers/lightnvm/pblk-core.c
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@ -1869,6 +1869,10 @@ void pblk_gen_run_ws(struct pblk *pblk, struct pblk_line *line, void *priv,
struct pblk_line_ws *line_ws;
line_ws = mempool_alloc(&pblk->gen_ws_pool, gfp_mask);
if (!line_ws) {
pblk_err(pblk, "pblk: could not allocate memory\n");
return;
}
line_ws->pblk = pblk;
line_ws->line = line;