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zram: free secondary algorithms names

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BugLink: https://bugs.launchpad.net/bugs/2097301

[ Upstream commit 684826f8271ad97580b138b9ffd462005e470b99 ]

We need to kfree() secondary algorithms names when reset zram device that
had multi-streams, otherwise we leak memory.

[senozhatsky@chromium.org: kfree(NULL) is legal]
  Link: https://lkml.kernel.org/r/20240917013021.868769-1-senozhatsky@chromium.org
Link: https://lkml.kernel.org/r/20240911025600.3681789-1-senozhatsky@chromium.org
Fixes: 001d927357 ("zram: add recompression algorithm sysfs knob")
Signed-off-by: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Minchan Kim <minchan@kernel.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
CVE-2024-50064
Signed-off-by: Manuel Diewald <manuel.diewald@canonical.com>
Signed-off-by: Koichiro Den <koichiro.den@canonical.com>
This commit is contained in:
Sergey Senozhatsky
2024-10-09 13:46:38 +09:00
committed by Mehmet Basaran
parent ac7264f589
commit f58ee48a3d
1 changed files with 5 additions and 0 deletions
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drivers/block/zram/zram_drv.c
+5
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@@ -1979,6 +1979,11 @@ static void zram_destroy_comps(struct zram *zram)
zcomp_destroy(comp);
zram->num_active_comps--;
}
for (prio = ZRAM_SECONDARY_COMP; prio < ZRAM_MAX_COMPS; prio++) {
kfree(zram->comp_algs[prio]);
zram->comp_algs[prio] = NULL;
}
}
static void zram_reset_device(struct zram *zram)