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From: Andrew Rybchenko <andrew.rybchenko@oktetlabs.ru>
To: Cristian Dumitrescu <cristian.dumitrescu@intel.com>
Cc: dev@dpdk.org, Ivan Ilchenko <ivan.ilchenko@oktetlabs.ru>,
	stable@dpdk.org, Andy Moreton <amoreton@xilinx.com>
Subject: [dpdk-dev] [PATCH v2] bitmap: fix buffer overrun in bitmap init function
Date: Wed,  2 Jun 2021 12:49:22 +0300
Message-ID: <20210602094922.3507384-1-andrew.rybchenko@oktetlabs.ru> (raw)
In-Reply-To: <20210602090629.3495940-1-andrew.rybchenko@oktetlabs.ru>

From: Ivan Ilchenko <ivan.ilchenko@oktetlabs.ru>

Bitmap initialization function is allowed to memset()
caller-provided buffer with number of bytes exceeded
this buffer size. This happens due to wrong comparison
sign between buffer size and number of bytes required
to initialize bitmap.

Fixes: 602c9ca33a4 ("sched: bitmap is now dynamically allocated")
Cc: stable@dpdk.org

Reported-by: Andy Moreton <amoreton@xilinx.com>
Signed-off-by: Ivan Ilchenko <ivan.ilchenko@oktetlabs.ru>
Reviewed-by: Andy Moreton <amoreton@xilinx.com>
Signed-off-by: Andrew Rybchenko <andrew.rybchenko@oktetlabs.ru>
---
 lib/eal/include/rte_bitmap.h | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/lib/eal/include/rte_bitmap.h b/lib/eal/include/rte_bitmap.h
index 9e2b8f2cbf..e4623bb176 100644
--- a/lib/eal/include/rte_bitmap.h
+++ b/lib/eal/include/rte_bitmap.h
@@ -185,9 +185,8 @@ rte_bitmap_init(uint32_t n_bits, uint8_t *mem, uint32_t mem_size)
 	size = __rte_bitmap_get_memory_footprint(n_bits,
 		&array1_byte_offset, &array1_slabs,
 		&array2_byte_offset, &array2_slabs);
-	if (size < mem_size) {
+	if (size > mem_size)
 		return NULL;
-	}
 
 	/* Setup bitmap */
 	memset(mem, 0, size);
-- 
2.30.2


  parent reply	other threads:[~2021-06-02  9:49 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-02  9:06 [dpdk-dev] [PATCH] " Andrew Rybchenko
2021-06-02  9:47 ` Andrew Rybchenko
2021-06-02  9:49 ` Andrew Rybchenko [this message]
2021-06-08 10:25   ` [dpdk-dev] [PATCH v2] " Dumitrescu, Cristian
2021-06-11  9:13     ` [dpdk-dev] [dpdk-stable] " David Marchand

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