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Message-Id: <20220916233305.3784826-1-floridsleeves@gmail.com>
Date: Fri, 16 Sep 2022 16:33:05 -0700
From: Li Zhong <floridsleeves@...il.com>
To: linux-kernel@...r.kernel.org, linux-raid@...r.kernel.org
Cc: song@...nel.org, Li Zhong <floridsleeves@...il.com>
Subject: [PATCH v2] drivers/md/md-bitmap: check the return value of md_bitmap_get_counter()
Check the return value of md_bitmap_get_counter() in case it returns
NULL pointer, which will result in a null pointer dereference.
v2: update the check to include other dereference
Signed-off-by: Li Zhong <floridsleeves@...il.com>
---
drivers/md/md-bitmap.c | 27 +++++++++++++++------------
1 file changed, 15 insertions(+), 12 deletions(-)
diff --git a/drivers/md/md-bitmap.c b/drivers/md/md-bitmap.c
index bf6dffadbe6f..63ece30114e5 100644
--- a/drivers/md/md-bitmap.c
+++ b/drivers/md/md-bitmap.c
@@ -2195,20 +2195,23 @@ int md_bitmap_resize(struct bitmap *bitmap, sector_t blocks,
if (set) {
bmc_new = md_bitmap_get_counter(&bitmap->counts, block, &new_blocks, 1);
- if (*bmc_new == 0) {
- /* need to set on-disk bits too. */
- sector_t end = block + new_blocks;
- sector_t start = block >> chunkshift;
- start <<= chunkshift;
- while (start < end) {
- md_bitmap_file_set_bit(bitmap, block);
- start += 1 << chunkshift;
+ if (bmc_new) {
+ if (*bmc_new == 0) {
+ /* need to set on-disk bits too. */
+ sector_t end = block + new_blocks;
+ sector_t start = block >> chunkshift;
+
+ start <<= chunkshift;
+ while (start < end) {
+ md_bitmap_file_set_bit(bitmap, block);
+ start += 1 << chunkshift;
+ }
+ *bmc_new = 2;
+ md_bitmap_count_page(&bitmap->counts, block, 1);
+ md_bitmap_set_pending(&bitmap->counts, block);
}
- *bmc_new = 2;
- md_bitmap_count_page(&bitmap->counts, block, 1);
- md_bitmap_set_pending(&bitmap->counts, block);
+ *bmc_new |= NEEDED_MASK;
}
- *bmc_new |= NEEDED_MASK;
if (new_blocks < old_blocks)
old_blocks = new_blocks;
}
--
2.25.1
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