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util: fix spdk_ioviter when used with count > 2
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Ubsan with clang complains when using spdk_ioviter with more iters than
declared in the array:

  iov.c:69:9: runtime error: index 3 out of bounds for type 'struct spdk_single_ioviter[2]'
  #0 0x5df709 in spdk_ioviter_firstv /home/vagrant/spdk_repo/spdk/lib/util/iov.c:69:9
  #1 0x53780b in raid5f_xor_stripe /home/vagrant/spdk_repo/spdk/module/bdev/raid/raid5f.c:270:24
  #2 0x531bd8 in raid5f_submit_write_request /home/vagrant/spdk_repo/spdk/module/bdev/raid/raid5f.c:520:2
  #3 0x52a03a in raid5f_submit_rw_request /home/vagrant/spdk_repo/spdk/module/bdev/raid/raid5f.c:596:9
  #4 0x548c17 in test_raid5f_write_request /home/vagrant/spdk_repo/spdk/test/unit/lib/bdev/raid/raid5f.c/raid5f_ut.c:550:2
  #5 0x544e18 in test_raid5f_submit_rw_request /home/vagrant/spdk_repo/spdk/test/unit/lib/bdev/raid/raid5f.c/raid5f_ut.c:714:3
  #6 0x553e61 in __test_raid5f_submit_full_stripe_write_request /home/vagrant/spdk_repo/spdk/test/unit/lib/bdev/raid/raid5f.c/raid5f_ut.c:878:3
  #7 0x543f84 in run_for_each_raid5f_config /home/vagrant/spdk_repo/spdk/test/unit/lib/bdev/raid/raid5f.c/raid5f_ut.c:748:3
  #8 0x527ac1 in test_raid5f_submit_full_stripe_write_request /home/vagrant/spdk_repo/spdk/test/unit/lib/bdev/raid/raid5f.c/raid5f_ut.c:885:2
  #9 0x7f4a71a0960a  (/usr/lib64/libcunit.so.1+0x460a) (BuildId: 9c82dd336cbccd99721651ac0a04435e746e0fc0)
  #10 0x7f4a71a09937  (/usr/lib64/libcunit.so.1+0x4937) (BuildId: 9c82dd336cbccd99721651ac0a04435e746e0fc0)
  #11 0x7f4a71a0a897 in CU_run_all_tests (/usr/lib64/libcunit.so.1+0x5897) (BuildId: 9c82dd336cbccd99721651ac0a04435e746e0fc0)
  #12 0x524fe8 in main /home/vagrant/spdk_repo/spdk/test/unit/lib/bdev/raid/raid5f.c/raid5f_ut.c:1006:2
  #13 0x7f4a711d750f in __libc_start_call_main (/usr/lib64/libc.so.6+0x2750f) (BuildId: 81daba31ee66dbd63efdc4252a872949d874d136)
  #14 0x7f4a711d75c8 in __libc_start_main@GLIBC_2.2.5 (/usr/lib64/libc.so.6+0x275c8) (BuildId: 81daba31ee66dbd63efdc4252a872949d874d136)
  #15 0x4235b4 in _start (/home/vagrant/spdk_repo/spdk/test/unit/lib/bdev/raid/raid5f.c/raid5f_ut+0x4235b4) (BuildId: 028d075edd1a7cd17881fd678ef076adfdbac13d)

Fix this by making iters a zero-length array and put it in a union with a
two-element array to keep the default size for compatibility.

Change-Id: I8573b015755e9986cdadbfa1705d269d51a7c2b7
Signed-off-by: Artur Paszkiewicz <artur.paszkiewicz@intel.com>
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/18402
Reviewed-by: Jim Harris <james.r.harris@intel.com>
Community-CI: Mellanox Build Bot
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Shuhei Matsumoto <smatsumoto@nvidia.com>
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@apaszkie @tomzawadzki
apaszkie authored and tomzawadzki committed May 29, 2023
1 parent 4114b4a commit 7d573d6
Showing 1 changed file with 12 additions and 7 deletions.
19 changes: 12 additions & 7 deletions include/spdk/util.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -104,6 +104,14 @@ spdk_divide_round_up(uint64_t num, uint64_t divisor)
return (num + divisor - 1) / divisor;
}

struct spdk_single_ioviter {
struct iovec *iov;
size_t iovcnt;
size_t idx;
size_t iov_len;
uint8_t *iov_base;
};

/**
* An N-way iovec iterator. Calculate the size, given N, using
* SPDK_IOVITER_SIZE. For backward compatibility, the structure
Expand All @@ -112,13 +120,10 @@ spdk_divide_round_up(uint64_t num, uint64_t divisor)
struct spdk_ioviter {
uint32_t count;

struct spdk_single_ioviter {
struct iovec *iov;
size_t iovcnt;
size_t idx;
size_t iov_len;
uint8_t *iov_base;
} iters[2];
union {
struct spdk_single_ioviter iters_compat[2];
struct spdk_single_ioviter iters[0];
};
};

/* count must be greater than or equal to 2 */
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