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authorDan Carpenter <dan.carpenter@oracle.com>2022-06-23 16:40:13 +0300
committerKees Cook <keescook@chromium.org>2022-06-23 18:27:52 +0300
commit2c09d1443b9b8b6e25bfb2acf51ad442cf9b314e (patch)
tree109eb872bf688d144edcd667996662ee9ed5a0a7 /fs/pstore
parente4f0a7ec586b7644107839f5394fb685cf1aadcc (diff)
downloadlinux-2c09d1443b9b8b6e25bfb2acf51ad442cf9b314e.tar.xz
pstore/zone: cleanup "rcnt" type
The info->read() function returns ssize_t. That means that info->read() either returns either negative error codes or a positive number representing the bytes read. The "rcnt" variable should be declared as ssize_t as well. Most places do this correctly but psz_kmsg_recover_meta() needed to be fixed. This code casts the "rcnt" to int. That is unnecessary when "rcnt" is already signed. It's also slightly wrong because if info->read() returned a very high (more than INT_MAX) number of bytes then this might treat that as an error. This bug cannot happen in real life, so it doesn't affect run time, but static checkers correctly complain that it is wrong. fs/pstore/zone.c:366 psz_kmsg_recover_data() warn: casting 'rcnt' truncates high bits Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Kees Cook <keescook@chromium.org> Link: https://lore.kernel.org/r/YrRtPSFHDVJzV6d+@kili
Diffstat (limited to 'fs/pstore')
-rw-r--r--fs/pstore/zone.c12
1 files changed, 6 insertions, 6 deletions
diff --git a/fs/pstore/zone.c b/fs/pstore/zone.c
index 7c8f8feac6c3..017d0d4ad329 100644
--- a/fs/pstore/zone.c
+++ b/fs/pstore/zone.c
@@ -363,7 +363,7 @@ static int psz_kmsg_recover_data(struct psz_context *cxt)
rcnt = info->read((char *)buf, zone->buffer_size + sizeof(*buf),
zone->off);
if (rcnt != zone->buffer_size + sizeof(*buf))
- return (int)rcnt < 0 ? (int)rcnt : -EIO;
+ return rcnt < 0 ? rcnt : -EIO;
}
return 0;
}
@@ -372,7 +372,7 @@ static int psz_kmsg_recover_meta(struct psz_context *cxt)
{
struct pstore_zone_info *info = cxt->pstore_zone_info;
struct pstore_zone *zone;
- size_t rcnt, len;
+ ssize_t rcnt, len;
struct psz_buffer *buf;
struct psz_kmsg_header *hdr;
struct timespec64 time = { };
@@ -400,7 +400,7 @@ static int psz_kmsg_recover_meta(struct psz_context *cxt)
continue;
} else if (rcnt != len) {
pr_err("read %s with id %lu failed\n", zone->name, i);
- return (int)rcnt < 0 ? (int)rcnt : -EIO;
+ return rcnt < 0 ? rcnt : -EIO;
}
if (buf->sig != zone->buffer->sig) {
@@ -502,7 +502,7 @@ static int psz_recover_zone(struct psz_context *cxt, struct pstore_zone *zone)
rcnt = info->read((char *)&tmpbuf, len, zone->off);
if (rcnt != len) {
pr_debug("read zone %s failed\n", zone->name);
- return (int)rcnt < 0 ? (int)rcnt : -EIO;
+ return rcnt < 0 ? rcnt : -EIO;
}
if (tmpbuf.sig != zone->buffer->sig) {
@@ -544,7 +544,7 @@ static int psz_recover_zone(struct psz_context *cxt, struct pstore_zone *zone)
rcnt = info->read(buf, len - start, off + start);
if (rcnt != len - start) {
pr_err("read zone %s failed\n", zone->name);
- ret = (int)rcnt < 0 ? (int)rcnt : -EIO;
+ ret = rcnt < 0 ? rcnt : -EIO;
goto free_oldbuf;
}
@@ -552,7 +552,7 @@ static int psz_recover_zone(struct psz_context *cxt, struct pstore_zone *zone)
rcnt = info->read(buf + len - start, start, off);
if (rcnt != start) {
pr_err("read zone %s failed\n", zone->name);
- ret = (int)rcnt < 0 ? (int)rcnt : -EIO;
+ ret = rcnt < 0 ? rcnt : -EIO;
goto free_oldbuf;
}