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Commit 5414e557 authored by Nitin Gupta's avatar Nitin Gupta Committed by Greg Kroah-Hartman
Browse files

staging: zram: fix data corruption issue 



In zram_read() and zram_write() we were not incrementing the
index number and thus were reading/writing values from/to
incorrect sectors on zram disk, resulting in data corruption.

Signed-off-by: default avatarNitin Gupta <ngupta@vflare.org>
Cc: stable <stable@kernel.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 0742cecb

drivers/staging/zram/zram_drv.c

+4 −0
Original line number Diff line number Diff line
@@ -227,6 +227,7 @@ static int zram_read(struct zram *zram, struct bio *bio) 


		if (zram_test_flag(zram, index, ZRAM_ZERO)) {

			handle_zero_page(page);

			index++;

			continue;

		}
@@ -235,12 +236,14 @@ static int zram_read(struct zram *zram, struct bio *bio) 
			pr_debug("Read before write: sector=%lu, size=%u",

				(ulong)(bio->bi_sector), bio->bi_size);

			/* Do nothing */

			index++;

			continue;

		}



		/* Page is stored uncompressed since it's incompressible */

		if (unlikely(zram_test_flag(zram, index, ZRAM_UNCOMPRESSED))) {

			handle_uncompressed_page(zram, page, index);

			index++;

			continue;

		}
@@ -320,6 +323,7 @@ static int zram_write(struct zram *zram, struct bio *bio) 
			mutex_unlock(&zram->lock);

			zram_stat_inc(&zram->stats.pages_zero);

			zram_set_flag(zram, index, ZRAM_ZERO);

			index++;

			continue;

		}