From: "Rob Herring (Arm)" <robh@xxxxxxxxxx> [ Upstream commit 935df1bd40d43c4ee91838c42a20e9af751885cc ] Factor out the parsing of interrupt-map interrupt parent phandle and its arg cells to a separate function, of_irq_parse_imap_parent(), so that it can be used in other parsing scenarios (e.g. fw_devlink). There was a refcount leak on non-matching entries when iterating thru "interrupt-map" which is fixed. Tested-by: Marc Zyngier <maz@xxxxxxxxxx> Tested-by: Anup Patel <apatel@xxxxxxxxxxxxxxxx> Link: https://lore.kernel.org/r/20240529-dt-interrupt-map-fix-v2-1-ef86dc5bcd2a@xxxxxxxxxx Signed-off-by: Rob Herring (Arm) <robh@xxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- drivers/of/irq.c | 125 ++++++++++++++++++++++++---------------- drivers/of/of_private.h | 3 + 2 files changed, 77 insertions(+), 51 deletions(-) diff --git a/drivers/of/irq.c b/drivers/of/irq.c index 2bac44f09554b..38ceb29b15f5e 100644 --- a/drivers/of/irq.c +++ b/drivers/of/irq.c @@ -25,6 +25,8 @@ #include <linux/string.h> #include <linux/slab.h> +#include "of_private.h" + /** * irq_of_parse_and_map - Parse and map an interrupt into linux virq space * @dev: Device node of the device whose interrupt is to be mapped @@ -96,6 +98,57 @@ static const char * const of_irq_imap_abusers[] = { NULL, }; +const __be32 *of_irq_parse_imap_parent(const __be32 *imap, int len, struct of_phandle_args *out_irq) +{ + u32 intsize, addrsize; + struct device_node *np; + + /* Get the interrupt parent */ + if (of_irq_workarounds & OF_IMAP_NO_PHANDLE) + np = of_node_get(of_irq_dflt_pic); + else + np = of_find_node_by_phandle(be32_to_cpup(imap)); + imap++; + + /* Check if not found */ + if (!np) { + pr_debug(" -> imap parent not found !\n"); + return NULL; + } + + /* Get #interrupt-cells and #address-cells of new parent */ + if (of_property_read_u32(np, "#interrupt-cells", + &intsize)) { + pr_debug(" -> parent lacks #interrupt-cells!\n"); + of_node_put(np); + return NULL; + } + if (of_property_read_u32(np, "#address-cells", + &addrsize)) + addrsize = 0; + + pr_debug(" -> intsize=%d, addrsize=%d\n", + intsize, addrsize); + + /* Check for malformed properties */ + if (WARN_ON(addrsize + intsize > MAX_PHANDLE_ARGS) + || (len < (addrsize + intsize))) { + of_node_put(np); + return NULL; + } + + pr_debug(" -> imaplen=%d\n", len); + + imap += addrsize + intsize; + + out_irq->np = np; + for (int i = 0; i < intsize; i++) + out_irq->args[i] = be32_to_cpup(imap - intsize + i); + out_irq->args_count = intsize; + + return imap; +} + /** * of_irq_parse_raw - Low level interrupt tree parsing * @addr: address specifier (start of "reg" property of the device) in be32 format @@ -112,12 +165,12 @@ static const char * const of_irq_imap_abusers[] = { */ int of_irq_parse_raw(const __be32 *addr, struct of_phandle_args *out_irq) { - struct device_node *ipar, *tnode, *old = NULL, *newpar = NULL; + struct device_node *ipar, *tnode, *old = NULL; __be32 initial_match_array[MAX_PHANDLE_ARGS]; const __be32 *match_array = initial_match_array; - const __be32 *tmp, *imap, *imask, dummy_imask[] = { [0 ... MAX_PHANDLE_ARGS] = cpu_to_be32(~0) }; - u32 intsize = 1, addrsize, newintsize = 0, newaddrsize = 0; - int imaplen, match, i, rc = -EINVAL; + const __be32 *tmp, dummy_imask[] = { [0 ... MAX_PHANDLE_ARGS] = cpu_to_be32(~0) }; + u32 intsize = 1, addrsize; + int i, rc = -EINVAL; #ifdef DEBUG of_print_phandle_args("of_irq_parse_raw: ", out_irq); @@ -176,6 +229,9 @@ int of_irq_parse_raw(const __be32 *addr, struct of_phandle_args *out_irq) /* Now start the actual "proper" walk of the interrupt tree */ while (ipar != NULL) { + int imaplen, match; + const __be32 *imap, *oldimap, *imask; + struct device_node *newpar; /* * Now check if cursor is an interrupt-controller and * if it is then we are done, unless there is an @@ -216,7 +272,7 @@ int of_irq_parse_raw(const __be32 *addr, struct of_phandle_args *out_irq) /* Parse interrupt-map */ match = 0; - while (imaplen > (addrsize + intsize + 1) && !match) { + while (imaplen > (addrsize + intsize + 1)) { /* Compare specifiers */ match = 1; for (i = 0; i < (addrsize + intsize); i++, imaplen--) @@ -224,48 +280,17 @@ int of_irq_parse_raw(const __be32 *addr, struct of_phandle_args *out_irq) pr_debug(" -> match=%d (imaplen=%d)\n", match, imaplen); - /* Get the interrupt parent */ - if (of_irq_workarounds & OF_IMAP_NO_PHANDLE) - newpar = of_node_get(of_irq_dflt_pic); - else - newpar = of_find_node_by_phandle(be32_to_cpup(imap)); - imap++; - --imaplen; - - /* Check if not found */ - if (newpar == NULL) { - pr_debug(" -> imap parent not found !\n"); - goto fail; - } - - if (!of_device_is_available(newpar)) - match = 0; - - /* Get #interrupt-cells and #address-cells of new - * parent - */ - if (of_property_read_u32(newpar, "#interrupt-cells", - &newintsize)) { - pr_debug(" -> parent lacks #interrupt-cells!\n"); - goto fail; - } - if (of_property_read_u32(newpar, "#address-cells", - &newaddrsize)) - newaddrsize = 0; - - pr_debug(" -> newintsize=%d, newaddrsize=%d\n", - newintsize, newaddrsize); - - /* Check for malformed properties */ - if (WARN_ON(newaddrsize + newintsize > MAX_PHANDLE_ARGS) - || (imaplen < (newaddrsize + newintsize))) { - rc = -EFAULT; + oldimap = imap; + imap = of_irq_parse_imap_parent(oldimap, imaplen, out_irq); + if (!imap) goto fail; - } - imap += newaddrsize + newintsize; - imaplen -= newaddrsize + newintsize; + match &= of_device_is_available(out_irq->np); + if (match) + break; + of_node_put(out_irq->np); + imaplen -= imap - oldimap; pr_debug(" -> imaplen=%d\n", imaplen); } if (!match) { @@ -287,11 +312,11 @@ int of_irq_parse_raw(const __be32 *addr, struct of_phandle_args *out_irq) * Successfully parsed an interrupt-map translation; copy new * interrupt specifier into the out_irq structure */ - match_array = imap - newaddrsize - newintsize; - for (i = 0; i < newintsize; i++) - out_irq->args[i] = be32_to_cpup(imap - newintsize + i); - out_irq->args_count = intsize = newintsize; - addrsize = newaddrsize; + match_array = oldimap + 1; + + newpar = out_irq->np; + intsize = out_irq->args_count; + addrsize = (imap - match_array) - intsize; if (ipar == newpar) { pr_debug("%pOF interrupt-map entry to self\n", ipar); @@ -300,7 +325,6 @@ int of_irq_parse_raw(const __be32 *addr, struct of_phandle_args *out_irq) skiplevel: /* Iterate again with new parent */ - out_irq->np = newpar; pr_debug(" -> new parent: %pOF\n", newpar); of_node_put(ipar); ipar = newpar; @@ -310,7 +334,6 @@ int of_irq_parse_raw(const __be32 *addr, struct of_phandle_args *out_irq) fail: of_node_put(ipar); - of_node_put(newpar); return rc; } diff --git a/drivers/of/of_private.h b/drivers/of/of_private.h index fb6792d381a6b..ee09d7141bcf8 100644 --- a/drivers/of/of_private.h +++ b/drivers/of/of_private.h @@ -151,6 +151,9 @@ extern void __of_sysfs_remove_bin_file(struct device_node *np, extern int of_bus_n_addr_cells(struct device_node *np); extern int of_bus_n_size_cells(struct device_node *np); +const __be32 *of_irq_parse_imap_parent(const __be32 *imap, int len, + struct of_phandle_args *out_irq); + struct bus_dma_region; #if defined(CONFIG_OF_ADDRESS) && defined(CONFIG_HAS_DMA) int of_dma_get_range(struct device_node *np, -- 2.43.0
