From: Sagi Grimberg Date: Sun, 23 Feb 2014 12:20:08 +0000 (+0200) Subject: Target/sbc: Don't use sg as iterator in sbc_verify_read X-Git-Url: http://pileus.org/git/?a=commitdiff_plain;h=fc272ec7a2dfe002b823c78f8ef0eb88042e2762;p=~andy%2Flinux Target/sbc: Don't use sg as iterator in sbc_verify_read Because then this sg is passed to sbc_copy_prot which will hit a protection fault in cases we have more than a single sg. Signed-off-by: Sagi Grimberg Signed-off-by: Nicholas Bellinger --- diff --git a/drivers/target/target_core_sbc.c b/drivers/target/target_core_sbc.c index ef1a58a134a..42f18fc1067 100644 --- a/drivers/target/target_core_sbc.c +++ b/drivers/target/target_core_sbc.c @@ -1162,7 +1162,7 @@ sbc_dif_verify_read(struct se_cmd *cmd, sector_t start, unsigned int sectors, { struct se_device *dev = cmd->se_dev; struct se_dif_v1_tuple *sdt; - struct scatterlist *dsg; + struct scatterlist *dsg, *psg = sg; sector_t sector = start; void *daddr, *paddr; int i, j, offset = sg_off; @@ -1170,14 +1170,14 @@ sbc_dif_verify_read(struct se_cmd *cmd, sector_t start, unsigned int sectors, for_each_sg(cmd->t_data_sg, dsg, cmd->t_data_nents, i) { daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; - paddr = kmap_atomic(sg_page(sg)) + sg->offset; + paddr = kmap_atomic(sg_page(psg)) + sg->offset; for (j = 0; j < dsg->length; j += dev->dev_attrib.block_size) { - if (offset >= sg->length) { + if (offset >= psg->length) { kunmap_atomic(paddr); - sg = sg_next(sg); - paddr = kmap_atomic(sg_page(sg)) + sg->offset; + psg = sg_next(psg); + paddr = kmap_atomic(sg_page(psg)) + psg->offset; offset = 0; }