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| author | Akinobu Mita <akinobu.mita@gmail.com> | 2015-04-13 23:21:56 +0900 |
|---|---|---|
| committer | Nicholas Bellinger <nab@linux-iscsi.org> | 2015-04-15 22:47:23 -0700 |
| commit | 38da0f49e8aa1649af397d53f88e163d0e60c058 (patch) | |
| tree | f1167920d1805849409cc9d71805b12c6cb560ea /drivers | |
| parent | dc0fafdab88b98581728a574885d0e4d9c6d0640 (diff) | |
| download | linux-38da0f49e8aa1649af397d53f88e163d0e60c058.tar.bz2 | |
target/file: Fix BUG() when CONFIG_DEBUG_SG=y and DIF protection enabled
When CONFIG_DEBUG_SG=y and DIF protection support enabled, kernel
BUG()s are triggered due to the following two issues:
1) prot_sg is not initialized by sg_init_table().
When CONFIG_DEBUG_SG=y, scatterlist helpers check sg entry has a
correct magic value.
2) vmalloc'ed buffer is passed to sg_set_buf().
sg_set_buf() uses virt_to_page() to convert virtual address to struct
page, but it doesn't work with vmalloc address. vmalloc_to_page()
should be used instead. As prot_buf isn't usually too large, so
fix it by allocating prot_buf by kmalloc instead of vmalloc.
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Sagi Grimberg <sagig@mellanox.com>
Cc: "Martin K. Petersen" <martin.petersen@oracle.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>
Cc: <stable@vger.kernel.org> # v3.14+
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/target/target_core_file.c | 15 |
1 files changed, 8 insertions, 7 deletions
diff --git a/drivers/target/target_core_file.c b/drivers/target/target_core_file.c index fa54835f398b..3dcfc73528ec 100644 --- a/drivers/target/target_core_file.c +++ b/drivers/target/target_core_file.c @@ -274,7 +274,7 @@ static int fd_do_prot_rw(struct se_cmd *cmd, struct fd_prot *fd_prot, se_dev->prot_length; if (!is_write) { - fd_prot->prot_buf = vzalloc(prot_size); + fd_prot->prot_buf = kzalloc(prot_size, GFP_KERNEL); if (!fd_prot->prot_buf) { pr_err("Unable to allocate fd_prot->prot_buf\n"); return -ENOMEM; @@ -286,9 +286,10 @@ static int fd_do_prot_rw(struct se_cmd *cmd, struct fd_prot *fd_prot, fd_prot->prot_sg_nents, GFP_KERNEL); if (!fd_prot->prot_sg) { pr_err("Unable to allocate fd_prot->prot_sg\n"); - vfree(fd_prot->prot_buf); + kfree(fd_prot->prot_buf); return -ENOMEM; } + sg_init_table(fd_prot->prot_sg, fd_prot->prot_sg_nents); size = prot_size; for_each_sg(fd_prot->prot_sg, sg, fd_prot->prot_sg_nents, i) { @@ -318,7 +319,7 @@ static int fd_do_prot_rw(struct se_cmd *cmd, struct fd_prot *fd_prot, if (is_write || ret < 0) { kfree(fd_prot->prot_sg); - vfree(fd_prot->prot_buf); + kfree(fd_prot->prot_buf); } return ret; @@ -599,11 +600,11 @@ fd_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents, 0, fd_prot.prot_sg, 0); if (rc) { kfree(fd_prot.prot_sg); - vfree(fd_prot.prot_buf); + kfree(fd_prot.prot_buf); return rc; } kfree(fd_prot.prot_sg); - vfree(fd_prot.prot_buf); + kfree(fd_prot.prot_buf); } } else { memset(&fd_prot, 0, sizeof(struct fd_prot)); @@ -619,7 +620,7 @@ fd_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents, 0, fd_prot.prot_sg, 0); if (rc) { kfree(fd_prot.prot_sg); - vfree(fd_prot.prot_buf); + kfree(fd_prot.prot_buf); return rc; } } @@ -655,7 +656,7 @@ fd_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents, if (ret < 0) { kfree(fd_prot.prot_sg); - vfree(fd_prot.prot_buf); + kfree(fd_prot.prot_buf); return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; } |